Questions Asked on
February 26, 2012

  1. math

    Please someone show me how to work this one out? Suppose Caroline is a cinephile and buys only movie tickets. Caroline deposits $3000 in a bank acct that pays an annual interest rate of 20%. You can assume that this interest rate is fixed-that is, it

    asked by nan
  2. calculus

    3. For what value of k will x+k/x have a relative maximum at x = -2? A. -4 B. -2 C. 2 D. 4 E. None of these

    asked by Taeyeon
  3. calculus

    4. When the area in square units of an expanding circle is increasing twice as fast as its radius in linear units, the radius is A. 1/4pi B.1/4 C.1/pi D. 1 E.pi

    asked by Taeyeon
  4. calculus

    1. If 3x^2+2xy+y2=2 then the value of dy/dx x = 1 is A. -2 B. 0 C. 2 D. 4 E. not defined

    asked by Taeyeon
  5. Chemistry

    Find the pH of mixture of acids. 0.185 M in HCHO2 and 0.225 M in HC2H3O2 Im using an ice chart of weak acid and putting in strong acid in H+ initiAL concentration. I've done the problems many different ways but cannot seem to get the right answer help

    asked by L.Bianchessi
  6. Collision in One Dimension

    After skiding down a snow-covered hill on an inner tube, Ashley is coasting across a level snowfield at a constant velocity of +2.2 m/s. Miranda runs after her at a velocity of +4.5 m/s and hops on the inner tube. How fast do the two of them slide across

    asked by Angela
  7. Chemistry

    A solution in which [H+] is 1000 times greater than [OH-] [OH-] = ?M

    asked by Matt D
  8. Chemistry

    The equilibrium constant for the reaction: 2NO(g)+Br2(g)2NOBr(g) Kc=1.3x10^-2 at 1000 Kelvin Calculate Kc for: NOBr(g)NO(g)+ 1/2Br2(g)

    asked by Colin
  9. Chemisty

    Photographic film contains silver bromide in gelatin. Once exposed, some of the silver bromide decomposes, producing fine grains of silver. The unexposed silver bromide is removed by treating the film with sodium thiosulfate. Soluble sodium silver

    asked by Denisha
  10. Physics please help! check if its correct

    A 3.00 kg stone is tied to a thin, light wire wrapped around the outer edge of the uniform 8.00 kg cylindrical pulley. The inner diameter of the pulley is 60.0 cm, while the outer diameter is 1.00 m. The system is released from rest, and there is no

    asked by Brit
  11. calculus

    the area of the first quadrant bounded by the y-axis, the line y=4-x, and the graph of y=x-cosx is approximately

    asked by Alyssa
  12. Physics

    A boy whose mass is 40kg runs up a flight of 30 steps each 150mm high in 6seconds. Find the average power developed (take g as 10m/s^2.

    asked by Igbekele
  13. Chemistry

    Which type of bond is formed between two chlorine atoms in a chlorine molecule? 1) polar covalent 2) nonpolar covalent 3) metallic 4) ionic

    asked by Case
  14. homework college chem.

    a sample of gas occupies a volume at 73. 1 mL. As it expands, it does 135.0 J of work on its surroundings at a constant pressure of 783 torr. what is the final volume of gas?

    asked by danielle
  15. physics

    A winch is used to drag a 375 N crate up a ramp at a constant speed of 75 cm/s by means of a rope that pulls parallel to the surface of the ramp. The rope slopes upward at 33 degreesabove the horizontal, and the coefficient of kinetic friction between the

    asked by dillion
  16. Calculus 3

    A ball is thrown at an angle of 45 degrees to the ground. If the ball lands 90m away, what is the initial speed of the ball? I know you use x(t)=(v*cos(alpha))t and y(t)=(v*sin(alpha))t-g/2t^2 but I'm still really confused about what to do. Please show all

    asked by Anonymous
  17. chemistry

    calculate the pH of 20.00mL of 2.00 M HCl diluted to 0.500 L

    asked by Colin
  18. math

    Rental cost for offices spaces have been going up at 6.2% per year compounded annually for the past 5 years. If office space rent is now $32 per square foot per month, what were the rental rates 5 years ago

    asked by momo
  19. Geometry

    20. The wheelchair ramp at the entrance of the Mission Bay Library has a slope of 1/18. What angle does the ramp make with the sidewalk? Round to the nearest degree.

    asked by Ariel
  20. Physics

    A body of mass 20g appears to have a mass of 13g in oil and 12g in water what is the relative density of oil.

    asked by Igbekele
  21. Physics 12

    A block mass m1 lying on a frictionless inclined plane is connected to a mass m2 by a massless cord passing over a pulley. 1.) determine a formula for the acceleration of the system in terms of m1, m2, Ө, and g. 2.)what conditions apply to mass m1 and m2

    asked by Anon
  22. Chemistry

    The value of Kw increases with increasing temperature. Is the autoionization of water endothermic or exothermic? In thinking its both but I don't know how to explain it.hmm...

    asked by L.Bianchessi
  23. economics

    Suppose Caroline is a cinephile and buys only movie tickets. Caroline deposits $3000 in a bank acct that pays an annual interest rate of 20%. You can assume that this interest rate is fixed-that is, it won’t change over time. At the time of her deposit,

    asked by nan
  24. Math

    A student opened her math book and computed the sum of the numbers on two pages. Then, she turned to the next page and computed the sum of the numbers on those two facing pages. Finally, she computed the product of the two sums, and her calculator

    asked by Jde
  25. Help --->Chemistry

    1) Complete and balance the following chemical reactins: 2HCI(aq)+Pb(NO3)2(aq)---> 2HI(aq)+K2SO3(s)---> Pb(NO3)2(aq)+2KCI(aq)---> Ba(NO3)2(aq)+Na2SO4(aq)---> K2CO3(aq)+Ba(NO3)2(aq)---> HCI(aq)+AgNO3(aq)---> 2) How could you separate gold from a mixture of

    asked by melek
  26. physics

    you are standing in a canyon. you shout and hear an echo 2 seconds later. what can you tell me about the width of the canyon?

    asked by Regina
  27. Physics

    A spring is mounted horizontally. A crate which has a mass of 8.5kg is pressed against the spring with a force of 350N. As a result the spring is compressed a distance of 82.0cm. The mass is then released and is allowed to slide along the horizontal,

    asked by James
  28. chemistry

    what isw the density of N2O,a gas at STP?

    asked by CARMEN
  29. Geometry

    38. For maximum accessibility, a wheelchair ramp should have a slope between 1/16 and 1/20. What is the range of angle measures that a ramp should make with a horizontal line? Round to the nearest degree.

    asked by Ariel
  30. chemistry

    Give the formula for the conjugate base of each acid. a. HSO4- SO4^2- b. H3PO4 H3PO4 c. HPO42- PO4^2- d. HNO3 NO3^-

    asked by krystal
  31. math

    When 6-year old Melanie arrived home from school, she was the first to eat cookies from a freshly baked batch. When 8-year old Felipe arrived home, he ate twice as many cookies as Melanie had eaten. When 9-year old Hillary arrived home, she ate 3 fewer

    asked by Francie
  32. physics/calculus 3

    A ball is thrown at an angle of 45 degrees to the ground. If the ball lands 90 m away, what is the initial speed of the ball?

    asked by Anonymous
  33. Physics

    A boy whose mass is 40kg runs up a flight of 30 steps each 150mm high in 6seconds. Find the average power developed (take g as 10m/s^2).

    asked by Igbekele
  34. physics

    A negatively charged balloon has 4.5 µC of charge. How many excess electrons are on this balloon? Answer in units of electrons

    asked by ivan
  35. Physics

    A husband and Wife take turns pulling their child in a wagon along a horizontal sidewalk. Each exerts a constant force and pulls the wagon through the same displacement. They do the same amount of work, but the husband's pulling force is directed 58

    asked by Natasha
  36. chemistry

    How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 132.0 mL of 0.21 M H2SO4?

    asked by Anonymous
  37. Chemistry

    Find the pH of mixture of acids. 0.185 M in HCHO2 and 0.225 M in HC2H3O2 Im using an ice chart of weak acid and putting in strong acid in H+ initiAL concentration. I've done the problems many different ways but cannot seem to get the right answer help

    asked by L.Bianchessi
  38. english

    romeo and Juliet Act 1 scene 3 questions: 1. what impression does the audience get of Juliet in this scene? 2.what impression does the audience get of Juliet's nurse on this scene? 3.Explain the extended metaphor used by Lady Capulet (lines 80-95) what is

    asked by patrik
  39. Chemistry(Urgent, please help)

    I have to calculate the concentration of I2 produced (# of moles of I2 produced / L) based on the stoichiometric ratio in the following equation. 2S2O3^2- + I2 -> 2I^- + S4O6^2- Would the # produced be 2 for I2. I am not sure what to use for L?

    asked by Hannah
  40. Math

    A restaurant owner has a luncheon special that consists of a cup of soup, half of a sandwich, and a beverage. She wants to advertise that a different luncheon of three items can be purchased 365 days of the year for $4.99 apiece. If she has 7 different

    asked by Jeremy
  41. chemistry

    A mixture formed by adding 55.0 mL of a 1.5x10^-2 M HCl to 140 mL of 1.0x10^-2 M HI. How do you calculate the pH for this problem?

    asked by brad
  42. chemistry

    Calculate pH for strong base solution: 15.0 mL of 1.20×10^−2 M Ca(OH)2 diluted to 460.0 mL

    asked by jeff
  43. chemistry

    You mix 55 mL of 1.00 M silver nitrate with 25 mL of 0.81 M sodium chloride. What mass of silver chloride should you form?

    asked by salena patel
  44. chemistry

    what is Kc for 2NOBr-->2NO+Br2 when the temperature is 1000K and the Kc is 1.3x10^-2

    asked by Anonymous
  45. physics

    A steroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 4.5e4kg and the force causes the speed to change from 7100 to 5500m/s. (A) What is the work done by the force? (B)

    asked by Natasha
  46. calculus

    Consider the curve defined by 2y^3+6X^2(y)- 12x^2 +6y=1 . a. Show that dy/dx= (4x-2xy)/(x^2+y^2+1) b. Write an equation of each horizontal tangent line to the curve. c. The line through the origin with slope -1 is tangent to the curve at point P. Find the

    asked by Taeyeon
  47. Physics

    A ball of mass 8kg falls from rest from a height of 100m neglecting air resistance. Calculate its kinetic energy after falling a distance of 30m(take g=10m/s^2).

    asked by Igbekele
  48. Physics

    A football kicked with an initial speed of 23.1m/s reaches a maximum height of 16.9m. At what angle was the ball kicked? What are the steps to solving this problem?

    asked by Brandi
  49. trig

    Solve for x if sin2x=cos(x+60 and x€ [-90,180].show all work details

    asked by please help now
  50. chemistry

    In the reaction below: Increasing the concentration of Cl2 will _____ at equilibrium. HAVE NO EFFECT

    asked by krystal
  51. Physics

    The string of a conical pendulum is 54.5 cm long and the mass of the bob is 0.22 kg. a) Find the angle between the string and the horizontal when the tension in the string is three times the weight of the bob. b)Under those conditions, what is the period

    asked by J
  52. Finance

    Determine how much you would be willing to pay for a bond that pays $60 annual interest indefinitely and never matures (i.e., a perpetuity), assuming you require an 8% rate of return on this investment.

    asked by Raechell
  53. economics

    If a farmer purchases a new tractor,is it included in the calculating of the GDP?

    asked by lerato
  54. earth-physics

    The Earth has an angular speed of 7.272 10-5 rad/s in its rotation. Find the new angular speed if an asteroid (m = 1.07 1022 kg) hits the Earth while traveling at a speed of 1.30 103 m/s (assume the asteroid is a point mass compared to the radius of the

    asked by huiol
  55. Physics

    A mass m1 on a horizontal shelf is attached by a thin string that passes over a frictionless pulley to a 2.5 kg mass (m2) that hangs over the side of the shelf 1.2 m above the ground. The system is released from rest at t = 0 and the 2.5 kg mass strikes

    asked by J
  56. math

    Associated press Online provided information from a fiscal analyst stating that during the past 20 years, the average after-tax income of the wealthiest 1% of Americans had grown from $263,700 to $677,900. What is the percent increase? Round to the nearest

    asked by Ela
  57. chemistry

    Give the formula for the conjugate base of each acid. a. HSO4- H2SO4- b. H3PO4 H4PO4 c. HPO42- H2PO42- d. HNO3 H2NO3

    asked by krystal
  58. physics

    A small cork with an excess charge of +7.0 µC is placed 0.16 m from another cork, which carries a charge of −3.2 µC. What is the magnitude of the electric force between the corks? The Coulomb constant is 8.98755 × 10 9 N · m2 /C 2 . Answer in units

    asked by ivan
  59. arithmetic

    An arithmetic n geometric sequence have the same first term 2.with the 2nd term x. the sum of the 3rd term of the AS is equal to the 3rd term of the GS. Give the first 3 terms of both sequences.

    asked by simphiwe
  60. homework help please! chemistry 111

    the specific heat of a certain type of metal is 0.128 J(grams per Celsius). What is the final temperature if 305J of heat is added to 74.8g of this metal initially at 20.0 degrees Celsius?

    asked by danielle
  61. math

    57 Cds in 8 organizers drawpicturesto tell how many are in each group and how many are left over.

    asked by Jacob
  62. Comunity school

    When using fraction strips, how do you know that two fractions are equivalent?

    asked by Gloria
  63. Accounting

    In its first month of operations, Cisler Company made three purchases of merchandise in the following sequence: (1) 300 units at $6, (2) 400 units at $8, and (3) 500 units at $9. Assuming there are 200 units on hand at the end of the period, compute the

    asked by Casey
  64. Chemistry

    The degree of polarity of a bond is indicated by 1) ionization energy difference 2) the shape of the molecule 3) electronegativity difference 4) the charge on the kernel

    asked by Anonymous
  65. physics

    How long will it take a motor 1500 watt motor to lift a 500kg elevator 30 meters? Give your answer in minutes.

    asked by Darcie
  66. Please help me with M1 kinematics!

    A particle is travelling with velocity (4i+5j)m/s. It undergoes an acceleration of magnitude 2.5m/s^2 in a direction given by the vector (3i-4j). Find the velocity and displacement of the particle from its initial position after 4s.

    asked by Jat
  67. phys2

    A 2.9-kg block is released from rest and allowed to slide down a frictionless surface and into a spring. The far end of the spring is attached to a wall, as shown. The initial height of the block is 0.34 m above the lowest part of the slide and the spring

    asked by opp
  68. Conservation if Linear Momentum

    A student (m = 66 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.04 s. The average force exerted on him by the ground is +18000 N, where the upward direction is taken to be the

    asked by Angela
  69. chemistry

    What is the mole fraction of NaOH in an aqueous solution that contains 20.5% NaOH by mass?

    asked by Anonymous
  70. Geometry

    If Gina cleans her room, then she will go to the mall. Which of these is logically equivalent to the given statement? Answer A. If Gina did not go to the mall, then she did not clean her room. B. If Gina did not go to the mall, then she cleaned her room.

    asked by Anonymous
  71. college chemistry

    A solution is made by adding 0.100 mole of ethyl ether to 0.841 mole of ethyl alcohol. If the vapor pressure of ethyl ether and ethyl alcohol at 20oC are 375 torr and 20.0 torr, respectively, the vapor pressure of the solution at 20oC (assuming ideal

    asked by renee
  72. Science

    What is a process that could cause an unconformity?

    asked by Linda
  73. physics

    The drawing shows a skateboarder moving at 5.34 m/s along a horizontal section of a track that is slanted upward by 47.7 ° above the horizontal at its end, which is 0.795 m above the ground. When she leaves the track, she follows the characteristic path

    asked by Alexander
  74. math

    A 4 ft spring measures 8 ft long after a mass weighing 8 pounds is attached to it. the medium through which the mass moves offers a damping force numerically equal to sqrt.2 times the instantaneous velocity. Find the equation of motion if the mass is

    asked by pam
  75. Math

    Bhu had $48, but received $100 as a birthday gift and used the money to pay off her debt. She spent half of the money on a gift for herself. Which expression BEST represents the number of dollars Bhu has left? a.(-48+100)÷2 b.(48+100)÷2 c.-48+100÷2

    asked by Gabriel
  76. running.from.myself

    3. how many lines of symmetry are in a 8-sided snowflake? 10, 12, 8, 16 1. how many lines of symmetry are in a 6-sided snowflake? 10, 11, 12, or 6 if you wanted to make hearts on your snowflake,, which sides of the right triangle would you have to draw

    asked by 12-year-old-poet
  77. algebra

    An airplane flying with the wind can cover a certain distance in a = 3 hours. The return trip against the wind takes b = 4.5 hours. How fast is the plane and what is the speed of the wind, if the one-way distance is c = 720 miles?

    asked by Libuse
  78. physics

    A puck of mass 5.0 kg moving at 16.5 m/s approaches an identical puck that is stationary on frictionless ice. After the collision, the first puck leaves with a speed v1 at 30º to the orginal line of motion. The second puck leaves with speed v2 at 60º.

    asked by alex
  79. PED 212

    Using the databases listed within the Ashford Online Library you will evaluate a research-based article from a peer reviewed journal. Your critique must be grammatically correct, properly cited, and utilize APA style of writing. Choose one of the following

    asked by teresa
  80. physics

    A block of mass M = 6.755 kg is pulled along a horizontal frictionless surface by a rope of mass m = 0.592 kg, as shown in Fig. 5-63. A horizontal force = 41.5 N is applied to one end of the rope. Assume that the rope only sags a negligible amount. Find

    asked by zach
  81. physics

    A uniform ladder 10.0 m long is leaning against a frictionless wall at an angle of 60.0° above the horizontal. The weight of the ladder is 21.8 lb. A 57.8-lb boy climbs 4.38 m up the ladder. What is the magnitude of the frictional force exerted on the

    asked by rachel
  82. Math

    Ted put several different integers in order from least to greatest. He then put the same integers in order from greatest to least. Both times the same number was third in order. Explain how this is possible.

    asked by Anonymous
  83. Finance

    A firm has $3 million market value and it sells preferred stock with a par value of $100. If the coupon rate on the preferred stock is 9% and the preferred stock trades at $95, what is the cost of preferred stock financing?

    asked by Michelle
  84. geometry

    In parallelogram TRIG, m∠R = 2x + 19 and m∠G = 4x - 17. What is m∠T

    asked by miguel
  85. Math!!!

    Mrs wong wants to invest $50000 for 3 years. Simple interest of 5% p.a. for the first year, and then interest compounded monthly at 3% p.a. in every subsequent year. Find the amount she will receive.

    asked by Nicole
  86. physics

    A line of charge with a uniform density of 36.3 nC/m lies along the line y = -14.8 cm, between the points with coordinates x = 0 and x = 44.9 cm. Calculate the electric field it creates at the origin. Enter first the x- and then the y-component.

    asked by Anonymous
  87. Chemistry

    How many grams of PI3 could actually be produced from 250 g of I2 and excess phosphorous if the reaction gives a 98.5% yield? P4 + 6I2 --> 4PI3

    asked by Anonymous
  88. Physics

    A wooden cube of side 5cm floats in water 200cm^2 of its depth below the water surface and ats sides are vertical calculate the density of the wood in g/cm^3.(1) Density of water in 1g(m^-3).

    asked by Igbekele
  89. Physics

    An object of volume 4cm^3 is totally immersed in liquid of density 1030kg/m^3. Calculate the upthrust of liquid on the object.

    asked by Igbekele
  90. statistics

    12. A statistics student received a grade of 85 on a statistics midterm. If the corresponding z score equaled +1.50, and the standard deviation equaled 7, what was the average grade on this exam? a. 95.5 b. 74.5 c. 78.0 d. Cannot determine without knowing

    asked by tim
  91. Physics

    A solid rectangular block measure 0.100*0.080m*0.060m and floats freely in a liquid of density 1354kg/m^2 if the depth of liquid 0.04m up the block largest side. Find the density of the block.

    asked by Igbekele
  92. physics

    A 750.0 N man, carrying a 1.9 kg physics textbook, stands at the center of a frozen pond of radius 9.0 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome his difficulty, he throws his textbook

    asked by Joe
  93. PED 212

    Reflective Journal After reading Chapter 1, reflect on how your perceptions of physical education have changed based on your understanding of its evolution.

    asked by teresa
  94. Chemistry

    50g of H2SO4 produce how many grams of H2?

    asked by charesse
  95. Physics

    The speed of sound is about 340 m/s. Assume that when the motion detector emits an ultrasonic pulse, it must detect the reflected pulse before it can emit its next pulse. Assuming that the length of the air track is about 2 meters, what is the maximum

    asked by Priscilla
  96. physics

    A river is moving at 4.0 m/s [s] , and a swimmer swims across it at 1.4 m/s [e] relative to the water. What is the swimmers velocity measure with respect to the river bank

    asked by Melissa
  97. psychology

    the effect of channel presentation and type of processing on recall of meaningful words

    asked by akweley
  98. science

    why don't hydrocarbons have hydrogen bonding?

    asked by Nat
  99. Physics

    A 7 kilogram bowling ball is dropped from a fourth story window. If each story is 3 meters high, use energy conservation (not the equations of motion) to find the ball's velocity when it strikes the ground. Ignore air resistance. 1/2 m v^2= mgh v= sqrt

    asked by TRACY
  100. physics

    A puck of mass 5.0 kg moving at 16.5 m/s approaches an identical puck that is stationary on frictionless ice. After the collision, the first puck leaves with a speed v1 at 30º to the orginal line of motion. The second puck leaves with speed v2 at 60º.

    asked by alex
  101. Physics

    A 1.00e2kg crate is being pushed across a horizontal floor by a force of P that makes an angle of 30.0 degrees below the horizontal. The coefficient of Kinetic Friction is 0.200. What should be the magnitude of P, So that the network done by it and the

    asked by Natasha
  102. Chemistry

    If very small concentrations of NaCl and AgNO3 are mixed, no precipitate forms. However, if large concentrations are mixed, a white precipitate forms. Can someone tell me a method for testing the hypothesis that "insoluble" salts would dissolve to some

    asked by Sarah
  103. trig

    Let P be the point on the unit circle U that corresponds to t. Find the coordinates of P and the exact values of the trigonometric functions of t whenever possible. 2pi 3pi/4 5pi/6 Three questions. I think those are supposed to be t.

    asked by Carter
  104. math

    Hiroshi jogs less than 4 miles each day. After n days,he has jogged 16 miles. Which inequality can be used to find the number of days it might have taken Hiroshi to jog 16 miles.

    asked by lisa
  105. Geometry

    Statement 1: “If she is stuck in traffic, then she is late.” Statement 2: “If she is late, then she is stuck in traffic.” Statement 3: “If she is not late, then she is not stuck in traffic.” Meg writes, “Statement 3 is the inverse of

    asked by Anonymous
  106. statistics

    In this unit we have worked with scores and their locations within a distribution. This discussion is designed to get you to think a little more about distributions of scores. Shown below are two samples of scores. Input these scores into SPSS and use

    asked by john
  107. chemistry 111

    in calibrating your thermometer by setting only the freezing and boiling points, what assumptions are you making regarding the internal diameter of the thermometer and the expansion of the thermometer fluid?

    asked by pat
  108. calculus

    the area of the first quadrant bounded by the y-axis, the line y=4-x, and the graph of y=x-cosx is approximately

    asked by Alyssa
  109. Physics

    Suppose that when you ride on your 7.90-kg bike the weight of you and the bike is supported equally by the two tires. If the gauge pressure in the tires is 72.5 lb/in2 and the area of contact between each tire and the road is 7.13 cm2, what is your weight?

    asked by Adrianna
  110. chemistry

    Water is amphoteric (can act as an acid or a base). a. Complete the chemical equation that shows water acting as a base. H2O + HCl ⇋ Cl- + H3O+ b. In this reaction, what is the conjugate acid of water? H3O+

    asked by krystal
  111. physics

    A river is moving at 4.0 m/s [s] , and a swimmer swims across it at 1.4 m/s [e] relative to the water. What is the swimmers velocity measure with respect to the river bank

    asked by Melissa
  112. algebra. help!!

    my answer is 63.56. i don't know if its right answer. here this problem: It takes Scott an average of 45 min to prune 1 tree. Victor takes 65 min to prune a tree on average. The Scott-Victor Pruning Service has the contract to prune 92 trees in Flagstaff,

    asked by cynthia
  113. physics

    A 1093 kg van, stopped at a traffic light, is hit directly in the rear by a 715 kg car traveling with a velocity of +2.38 m/s. Assume that the transmission of the van is in neutral, the brakes are not being applied, and the collision is elastic. What is

    asked by Tom
  114. Calculus

    A right triangle with hypotenuse y and equal legs of size x has a perimeter of 36m. Express the area of the triangle solely in terms of the hypotenuse y.

    asked by Nurcan
  115. physics

    a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine? Please help power= work/time= 1/2 m v^2/8 1/2(1500k)(30)^2 2/8 =168750 is this correct?

    asked by TRACY
  116. COLLEGE CALCULUS. HELP!

    Find the derivative of the function. 1. F(x)= (1+2x+x^3)^1/4 2. f(t)= (1+tant)^1/3

    asked by cynthia
  117. chemistry

    4KCl + 4HNO3 + O2 ==> 4KNO3 + 2Cl2 + 2H2O what kind of reaction is this?

    asked by mark
  118. Physics

    A capacitor consisting of two parallel plates of area A = 4.6 m2 and spacing d = 0.150 m is filled with two parallel slabs of dielectric material of equal thickness and with dielectric constants 1 = 2.20 and 2 = 5.50, respectively. What is the total

    asked by Meghan
  119. phys3

    A motorist driving a 1100-kg car on level ground accelerates from 20.0 m/s to 30.0 m/s in a time of 5.6 s. Neglecting friction and air resistance, determine the average mechanical power in watts the engine must supply during this time interval.

    asked by opp
  120. math

    Determine whether the system is consistent, inconsistent, or dependent. 3x - 3y = -9 9x - 9y = -27

    asked by Anonymous
  121. fin/370

    Firm A had $10,000 in assets entirely financed with equity. Firm B also has $10,000, but these assets are financed by $5,000 in debt (with a 10 percent rate of interest) and $5,000 in equity. Both firms sell 10,000 units of output at $2.50 per unit. The

    asked by gail
  122. Communication

    The perception process involves three parts: listening, absorbing, and reacting. False A child growing up on a deserted island would have no self-concept. False How you look at the world depends on what you think of yourself; and what you think of yourself

    asked by Anonymous
  123. math

    what is the lowest common denominator of 2/32 plus 4/28

    asked by angela
  124. Numerical Methods

    Derive the following formulas using Taylor series and then establish the error terms for each. f'(x) approx= (1/2*h)[4f(x+h)-3f(x)-f(x+2h)] f'(x) approx= (1/4*h)[f(x+2h)-f(x-2h)]

    asked by Dan
  125. Problem with 2 English sentences (French student)

    Bonjour! Dans un livre, j'ai lu cette phrase (je précise que l'auteur parle d'une situation présente aux États-Unis): Starbucks promised to create a new line of three fair-trade-certified whole-bean coffees (and four more under its Seattle's Best Coffee

    asked by green_heart
  126. Chemistry

    25.0 ml of a 0.100 M solution of the weak acid, CH3OOH is titrated with a 0.10 M solution of the strong base, NaOH. Calculate the pH of the equivalence point.

    asked by ASood
  127. psy

    The untimely death of Professor Hathaway halted his groundbreaking research into the uses of solar power. It therefore appears that Hathaway’s research will not result in practical applications. Which one of the following, if true, most seriously weakens

    asked by Anonymous
  128. Finance

    2. You are now considering adding a corporate bond to your investment portfolio. The bond was issued last year to have 10 years to maturity (so it has 9 years remaining to maturity from today) The bond has an 8% coupon, and was sold at par ($1,000) when it

    asked by rongbo
  129. calculus

    Consider a differentiable functionf having domain all positive real numbers, and for which it is known that f'(x)=(4-x)^-3 for x.0 a. find the x-coordinate of the critical point f. DEtermine whether the point is a relative maximum or minomum, or neither

    asked by cher
  130. Science

    How would earth move if the sun including its gravity suddenly disappeared? Explain your answer.

    asked by Cassie
  131. PHYSICS

    a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine? Please help

    asked by TRACY
  132. chemistry

    Potassium nitrate is made by adding potassium chloride to hydrogen nitrate in the presence of oxygen gas. Along with the potassium nitrate, chlorine and water are produced. How would write the equation?

    asked by mark
  133. world history

    Analyze the changes in global commerce between 1750 and 1900 due to changes in technology, communication, and economic theory.

    asked by Emily
  134. trig

    sin [sin -1 (7/25) - cos -1 (-8/17)]

    asked by Ansley
  135. Math

    At the beginning of the week, an electronics store took count of how many tvs and radios there were in the stockroom. The manager found that there was a ratio of 3 tvs for every 2 radios. At the end of the week, the manager counted 24 boxes left in the

    asked by Jennie
  136. phys1

    A 528 kg automobile is moving at 20.4 m/s at a height of 5.0 m above the bottom of a hill when it runs out of gasoline. The car coasts down the hill and then continues coasting up the other side until it comes to rest. Ignoring frictional forces and air

    asked by opp
  137. algebra. help!!

    6 hour have to change to minute. i hate words problem. so here the problem: Two candles are the same length. One candle takes 6 hours to burn all the way down while the other candle takes 9 hours. If the two candles are lit at the same time, how long will

    asked by deadlove
  138. English

    Thank you very much. I would like you to help me rephrase question 1, and check 2 and 3. 1)Go over George Orwell's life focusing your attention on those episodes which strengthened his indifference to accepted values and strong-mindedness 2) What sort of

    asked by Henry2
  139. calculus

    5. A particle moves along the y – axis with velocity given by v(t)=tsine(t^2) for t>=0 . a. In which direction (up or down) is the particle moving at time t = 1.5? Why? b. Find the acceleration of the particle at time t= 1.5. Is the velocity of the

    asked by Taeyeon
  140. chemistry

    4KCl + 4HNO3 + O2 ==> 4KNO3 + 2Cl2 + 2H2O I meant from * combustion decomposition synthesis single replacement double replacement

    asked by mark
  141. Physical Science

    How much work is needed to lift an object with a mass of 51.0 kg to a height of 2.00 meters?  Calculate your answer in Joules Answer

    asked by Anonymous
  142. math

    For the quadratic surface defined by 36x^2-72x-9y^2-36y-16z^2+96z-288=0 Put the surface into standard form and identify the center of the surface

    asked by Lucy
  143. physics

    Calculate the work required to lift a 20kg object from the floor to a height of 2 meters. Give your answer in Joules

    asked by Darcie
  144. math

    Gemma is making necklaces. She needs 10 beads for each one. She has 64 beads altogether. how many necklaces can she make?

    asked by james
  145. Math/Trig

    Period: Asymptotes: Range: a) y= 2 sec (x) + 1 b) y= -2 csc (x - pi/2) c) y= 1 + tan (x + pi/4) d) y= 1/2 + csc (x - pi) + 1 e) y= cot (3x + pi) + 2 Any tips on drawing the graph?

    asked by Krystal
  146. college

    Assignment Testing a Theory Write at least 300 words describing a time when you had to test a theory. This theory may be something you have tested at work, school, or even at home. Answer the following questions in your summary: • What type of informal

    asked by shellie
  147. Math

    Ted put several different integers in order from least to greatest. He then put the same integers in order from greatest to least. Both times the same number was third in order. Explain how this is possible.

    asked by Anonymous
  148. pre-calc

    Given sin x = -5/6 and x is in Quadrant IV, find cos 2x (1 point)

    asked by Nicole
  149. Math

    Verify the identities by transforming the left-hand side into the right-hand side. Show work. (tan^2X)/(1-cos^2x)= sec^2x HELP

    asked by Carter
  150. precal

    given tanx= (1/2) and cscx

    asked by Logan
  151. role of IT in mass communication

    need some articles related to this topic.plese provide me some links.

    asked by zehra jawed
  152. English

    Writeacher, I'd like you to help me check this paragraph. Thank you. 1) We are urgently looking for an English school, which is interested in a long-term cooperation (??) with our school. We would like to start with an email partnership followed by a

    asked by Henry2
  153. Math

    30 percent of the members of a health club are joggers. 55 percent of the joggers are female, and 60 percent of the non-joggers are female. If 500 people are members of the health club, what is the probability that a member is a male jogger? Explain.

    asked by Cassie
  154. physics

    The frequency of oscillation of the wave emitted by an FM radio station is 80.9 MHz. Find the period of vibration. Radio waves travel at a speed of light; 3 × 10 8 m/s. Answer in units of ns 002 (part 2 of 2) Find the wavelength. Answer in units of m

    asked by amanda and leah
  155. math

    Each lettter in the word UTICA was written on a slip of paper.One slip of paper was chosen without looking. Vowels are the letters A,E,I,O and U.What is the probability that the letter written on the chosen slip of paper was a vowel?

    asked by gary
  156. PHYSICS

    A 7 kilogram bowling ball is dropped from a fourth story window. If each story is 3 meters high, use energy conservation (not the equations of motion) to find the ball's velocity when it strikes the ground. Ignore air resistance.

    asked by TRACY
  157. Chemistry(Please check answers)

    1) The decomposition of hydrogen peroxide in solution and in the presence of iodide ion was studied in laboratory, and the following mechanism proposed based on the experimental data. H2O2 + I - = H2O + IO - (slow) H2O2 + IO - = H2O + O2 + I - (fast) Which

    asked by Hannah
  158. math

    A homeowner wants to plant a garden in his backyard. He decides to have 375 square feet garden and wants the garden to be 10 feet longer than it is wide. Find the dimensions of the garden.

    asked by cris
  159. chemistry

    What is the volume of CO2 at 25 degrees C and 1.3atm if 10.0g of Cburns at STP?

    asked by angelica
  160. Math

    30 percent of the members of a health club are joggers. 55 percent of the joggers are female, and 60 percent of the non-joggers are female. If 500 people are members of the health club, what is the probability that a member is a male jogger? Explain.

    asked by Cassie
  161. physics

    Calculate the net charge on a substance consisting of a combination of 8.9 × 10 13 protons and 4.4 × 10 13 electrons. Answer in units of C

    asked by ivan
  162. Math

    Solve for x. 9-4x

    asked by anonymous
  163. math

    Mr. Jaskson's lunch cost $8.00 plus 8% sales tax. He tipped the server 15% of total bill after sales tax was added. How much did Mr. Jackson spend in all?

    asked by erica
  164. Chemistry

    I had to perform an experiment for rate of reaction. The point of the experiment was to show how changes in reactant concentration, temperature, and catalyst presence can affect the rate of a reaction. The reaction that we studied was H2O2 + 2I^- + 2H^+ ->

    asked by Hannah
  165. earth

    how long does it take for light from Jupiter to come to earth. for example tonight the planet Jupiter can be seen by the moon, 2/25/12 and we see the light from the planet and how old is that light. thanks. jerry in colorado USA

    asked by jerry
  166. algebra

    a landscaper uses square tiles to make garden paths the ends of the paths are always 2 tiles wide, and the center portions of the paths are 3 tiles wide. what equation gives the total number y of tiles needed to make a path with a length of x tiles. the

    asked by bri
  167. calculus

    Find the area between the graph of f and the x-axis over the interval [−4, 1] when f(x) = 4 + 4x. 1. Area = 34 sq. units 2. Area = 30 sq. units 3. Area = 28 sq. units 4. Area = 32 sq. units 5. Area = 26 sq. units

    asked by Hillcrest
  168. Math

    okay so the equation is -4.9t^2 - 39.2t + 1.6 If the rockets explode at the highest point (which max height is 80 meters) One of the rockets is schedules to explode 2 minutes and 28 seconds into the program. When should the rocket be fired from the barge?

    asked by Marisol
  169. Math

    Matt has a deck of 20 cards. Of these 15 are numbers cards and 5 face cards. What is the probability of drawing a number card from the whole deck?

    asked by Brandon
  170. Math

    Mary has 8 pairs of dress shoes. How many different ways can she arrange five pairs of her shoes in her closet?

    asked by Susan
  171. stats

    . Each week during the first half of the semester, a sample of 50 students was polled to determine how many of them had their homework done before class. The following arc the results of the weekly polls: Week # # of students with homework done 1 1 2 8 3

    asked by tim
  172. math

    ms. gries is an athlete. she is skis every day for 5 days. she skis for 1 1/2 hours for her first day and increases her time by 1 1/4 hours for her next four days. how many hours will she ski on the fifth day? show you work

    asked by Savanna
  173. Math-venn diag.

    97 students take history and 124 take english. there are 43 of these students who take both history and english. what is the toal number of students taking history, english or both classes?

    asked by susan
  174. physic

    A rowboat crosses a river with a velocity of 3.42 mi/h at an angle 62.5° north of west relative to the water. The river is 0.610 mi wide and carries an eastward current of 1.25 mi/h. How far upstream is the boat when it reaches the opposite shore?

    asked by jen
  175. Math

    There are four people that want to cross a bridge. Sam can cross in 1 minute, Joe can cross in 2, Jack can cross in 5, and Steve can cross in 10. They have one flashlight, and two can cross at a time, but they must go at the same pace. So if Steve and Sam

    asked by Jacob
  176. chemistry

    You are a chemist requested to review and analyse certain debris found on thebottom of aboot found in a crime scene. The debris contains metal fragments. If you identify the metal fragments---it will help the detctive identify the locations traveled by the

    asked by Jimmy
  177. Chemistry

    If acetic acid is the only acid that vinegar contains , calculate the concentration of acetic acid in the vinegar. if the pH of vinegar is 2.7

    asked by Taylor
  178. world history

    In what ways did geography and climates affect the development of human society?

    asked by Tami
  179. Calculus

    1. I really don't understand what this problem is asking for The population P(t) of fish in a lake satisfies the logistic differential equation dP/dt = 3P - (P^2)/6000 If P(0) = 4000, what is ? Is the solution increasing or decreasing? && how would you

    asked by Kaylen
  180. English

    Are there any symbols, crests or badges for online and regular support groups??

    asked by Anonymous
  181. prealgebra

    How do you solve this??? foodbill:$18 salestax:%5 Tip:%20

    asked by vick
  182. chemistry

    if the activation energy for a given compound is found to be 10 kJ/mol, with a frequency factor of 4.0x10^13 s-1, what is the rate constant for this reaction at 398K?

    asked by hall
  183. English

    Writeacher, I need your help to improve the questions below. I included part of the answers to make sense of the questions. Students should be able to develop their answers by writing ten-line paragraphs. 1) Describe the details of Winston Smith's life as

    asked by Henry2
  184. English

    Writeacher, here is the other question I'd like them to answer. 1) Go over George Orwell's life focusing your attention on those episodes which strengthened his indifference to accepted values and strong-mindedness. (I don’t want students to repeat

    asked by Henry2
  185. social studies

    Please give me 2 more reasons of how totem poles and history books are the same or similar.Thank You Very Much!!!!!!!!

    asked by Gabby ( 5 grade)
  186. Chemisty

    What mass of aluminum is produced by the decompisition of 7.47 kg of Al2O3?

    asked by Cheery`
  187. math

    the ratio of boys to girls in a class is 8:17 . how many boys are there if total students are 375

    asked by nawaf
  188. spell

    For the following items, mark the choice which is spelled incorrectly. Prolong Perpetuete Protract Continue

    asked by Jasmine
  189. yShanQHSqoMzjxzgyLW

    cECXBe Is anybody strong in radio here? We need a colleague who would tell us briefly about the transistor T2. I hope there are radio amateurs here. If it`s not on the subject at all, then I`m sorry. I have to write because I have no choice. PS: if the

    asked by cECXBe Is anybody strong in radio here? We need a
  190. social studies

    Give 2 examples of how your life might be different if these freedoms and rights were not protested.

    asked by Gabby ( 5 grade)
  191. Math

    97 students take history and 124 take English. re of the students take both. What is the total # taking both classes.

    asked by Susan
  192. Political SCIENCE

    Briefly explain the steps that a President-elect goes through from the national convention to the inauguration

    asked by CHEYANNE
  193. English

    Writeacher, I'd like you to check questions from 1 to 4 and improve them. Thank you very much. 1) Give a detailed description of Winston Smith as it appears in the opening to George Orwell's 1984. Refer to the place where he lives, the instrument used by

    asked by Henry2
  194. physics

    When struck with hammer a turnng fork vibrates back and forth 230 times every second. What is the wavelength of a sound wave coming from this turning fork?

    asked by naila
  195. Spanish-Please check

    We had to write a conversation in Spanish between a clerk and me wanting to buy pants I wanted them to be loose and I had to pay in cash Could you please check La dependienta: ¿En qué puedo servirle señor? La clienta: Busco los pantalones negro pero

    asked by Tom
  196. math

    What is the scientific notation for 15 x 10 to the 5th?

    asked by Grant
  197. chemistry

    An aqueous salt solution is formed by adding 11.67 g sodium sulfate (solute) to water (solvent). What mass (in g) of water is used if the freezing point of the solution is -12.9 oF. Kf H2O = 1.86 oC/m I know to use delta T= i*Kf*m I then solve for m. But,

    asked by Alyssa
  198. trig

    If csc theta = 2, then what is theta approximated to 4 decimal points? RADIANS

    asked by Carter
  199. nonfiction

    why did the egyptians embalm bodies

    asked by zavier
  200. chemistry

    Which is the conjugate base of the bicarbonate ion, HCO3-? CO3 2-

    asked by krystal
  201. nonfiction

    why was the reign of ramses 2 so successful?

    asked by zavier
  202. Stats

    Explain how to calculate margin of error. What effect does increasing your sample size have on the margin of error? What effect does it have on the confidence level? What effect does it have on the confidence interval?

    asked by Kelly
  203. nonfiction

    why did the egyptians have such great respect for the pharaohs ?

    asked by zavier
  204. algebra

    A collection of nickels, dimes, and quarters amounts to $9.50. If there are 130 coins in all and there are twice as many dimes as there are quarters, find the number of nickels.

    asked by Libuse
  205. Physics

    Calculate the electric field at a point 3.12 cm perpendicular to the midpoint of a 2.23 m long thin wire carrying a total charge of 5.45 uC.

    asked by Vanessa
  206. stats

    if one can choose any six of 40 numbers, in any order, to play a state lottery game, how many different arrangments are possible?

    asked by tim
  207. MATH

    THE HOSTEL OF AN ENGINEERING INSTITUTE HAS 320 STUDENTS AND THE FOOD STOCK FOR 80 DAYS. IF 20 STUDENTS LEAVE THE HOSTEL AFTER 20 DAYS,FOR HOW MANY MORE DAYS WILL THE FOOD LAST?

    asked by RAVI
  208. Calculus 3

    Given the function f(x,y)=y/(x^2+y^2), give and identify the level curves for k=1, k=1/2, and k=1/4, and draw a contour map showing these level curves. Any help would be immensely appreciated. Thanks

    asked by Anonymous
  209. Advanced Maths (Vectors) AQA Level, please help?

    An object is moving in a plane. At time t =0,it is at origin O, and moving with velocity u. After 2 seconds, it is at A, where OA = -2i - 4j. After 3 seconds, it is at B, where AB= 10i -40 j. Show that this is consistent with constant acceleration a. Find

    asked by Jat
  210. college algebra

    Given f(x)= x^2-3+2 and g(x)=2x-4 find (fg)(-3)

    asked by Missy
  211. English

    Writeacher, I rephrased the sentences as you told me. I would also like you to help me rephrase question 1. 1)Go over George Orwell's life focusing your attention on those episodes which strengthened his indifference to accepted values and

    asked by Henry2
  212. physics

    The 20kg object is dropped from a height of 2 meters. Find its speed when it hits the ground. Give your answer in meters per second.

    asked by Darcie
  213. Maths

    solve the following eq. [0

    asked by demolitrate
  214. Advanced Maths (Vectors) AQA Level, please help

    An aircraft is traveling horizontally in an easterly direction at a height of 400 m above level ground and at a speed of 120 m/s. when it is directly above the observer, M, it releases a package. In relation to origin O and to x and y directions of east

    asked by Jat
  215. physics

    A 1289 Hz sound from the speaker enters a tube at point A. It then takes two paths, ACD or ABD. Minimum sound is heard when ACD has a length of 94.2 cm and ABD has a length of 41.0 cm. The length of ACD is slowly increased until the point of maximum

    asked by Tom
  216. Physics

    Under what conditions would an applied force increase the Kinetic energy of an object?

    asked by Natasha
  217. Statistics

    Consider a binomial experiment with 520 trials and 200 successes. To construct a test for a proportion p, what value do we use for the sample test statistic? Round your answer to two decimal places.

    asked by Damon
  218. life skills

    how an essay is constructed?

    asked by shantel
  219. Chemistry

    If 62.7 ml of .208M HCL is needed to needed to neutralize a solution of Ca(OH)2, how many grams of Ca(OH)2 must be in the solution?

    asked by Arianna
  220. chemistry

    A 0.85 g sample of solute with a molecular mass of 185 g/mol is dissolved in 2.25 g of benzene. What is the expected boiling point of the solution?

    asked by sage
  221. Math

    In right triangle PRS, sin ÚP = (8/17) What is

    asked by Deana
  222. Geometry

    Which statement is true for the expression 6a + 15b − 4a − 8c? Answer A. It can be written as 6a + 15b − 8c − 4a by using addition property of equality. B. It can be written as 6a − 4a + 15b − 8c by using distributive property of addition. C.It

    asked by Anonymous
  223. Math

    solution to the equation x2 – 9x – 22 = 0?

    asked by Deana
  224. math

    A customer is buying a $100 drill and two $15 drill bit sets. The customer uses a gift card worth $50 to pay for a portion of their bill. How much cash will the customer pay (before taxes)?

    asked by Anonymous
  225. arithmetic

    in a geometric sequence the first term is 48 and the fifth term is 3-Find the first 5 terms

    asked by simphiwe
  226. U.S. History

    According to Paine, how has our connection to England made the American colonies weaker in a military-political sense?

    asked by Anonymous
  227. ma th problem

    having problem solving (3-x)/(7-x)=4/(x-7)

    asked by Lavern
  228. Physics Help!!!

    A pitcher throws a 0.111-kg baseball, and it approaches the bat at a speed of 37.4 m/s. The bat does 78.6 J of work on the ball in hitting it. Ignoring air resistance, determine the speed of the ball after the ball leaves the bat and is 30.8 m above the

    asked by Isaac
  229. English

    Writeacher, I need you to check a paragraph I wrote some time ago. You revised just part of it. Thank you. 1)Speaker 4 has had lots of interviews lately. He was getting a bit blasé by the time he had my last interview. What he hadn't planned though was he

    asked by Henry2
  230. COMM215

    Should I use a comma after story and after the question mark as shown below? “Have you ever read the story, ‘The Tell-Tale Heart’ by Edgar Allan Poe?,” Dave asked. And, should I use a comma after say and after the question as shown below? “Did

    asked by Al
  231. statistics

    If a mean average score on 8 tests is 83.750. What is the total sum of the scores?

    asked by donna
  232. Physics

    The mass of the thread was neglected in the experiment. If this mass were 0.2 gram, estimate the largest error in the acceleration that it might have caused. Could this account for your observed errors?

    asked by Priscilla
  233. Math Help

    Help me to solve this problem Simplify by adding 5/22t + 2/4t

    asked by Lavern
  234. social studies

    When the Constitution was being ratified by thestates, why did many Americans want these freedoms and rights protected by the government?

    asked by Gabby ( 5 grade)
  235. Calcules

    Find thllowing limits using agebraic manipulations. a) lim (4t^2 -t-1)/(t^2 -1) = ? t--> -1

    asked by Nurcan
  236. Calcules

    Find the following limit using algeraic manipulations. (Give excat asnwers). lim (4t^2 -t-1)/(t^2 -1) t--> -1

    asked by Nurcan
  237. pre-calc

    Given sin x = -5/6 and x is in Quadrant IV, find cos 2x (1 point)

    asked by Nicole
  238. Finite Math

    Working on this for a couple of hours, any help? Input -output matrix F S C F .1 0 .2 S .2 .1 .4 C 0 0 .1 F= Food S=Shelter C=Clothing x=(I-A)^-1(D) 1)What should the total production of the three industries be to generate a $900,000 surplus each? I gotthe

    asked by MV
  239. Aviation

    What location of CG (forward or aft center of gravity) would be the most fuel efficient? The most stable? Could you change this situation if you changed the design of the aircraft?

    asked by Mike
  240. Math

    What is the range of 100, 95, 88, 0, and 87?

    asked by Jean
  241. Education

    The major emphasis of Movement programs for young children is the development of concepts. In what three major categories are they broken into? Body,space,time What , who, were Movement skill and fitness Awareness , knowledge and understanding I think it's

    asked by DE
  242. chemistry

    what test would you form to verify the presence of the Na+4 and the Po4,3-ion in plant food

    asked by Anonymous
  243. math

    how would you solve: (t-2)(3t-1)(4t+3)-(2-t)(2-t)(t+5)

    asked by martha
  244. Heat Transfer

    Derive the general heat conduction equation in cylindrical coordinates by applying the first law to the volume element.

    asked by Farant
  245. child care

    children should not be served drinks in containers made of a( Styrofoam c) treated ceramic B) uninsulated d) stainless steel

    asked by Catherine
  246. stats

    20. The sponsor of a local soccer tournament is responsible for writing an article for the local paper announcing the 151, 2nd, and3rdplacewinners. If10teamsareinvitedtothe tournament, and the sponsor wanted to get the article written in advance so it can

    asked by tim
  247. Math-Probab.

    In a deck of 52 cards there are 13 hearts. If 3 are drawn from the deck, without replacement, what is the probability that all 3 cards will be hearts?

    asked by Jane
  248. 8th grade math

    The time is now between 3 and 4 o'clock. Fifty-four minutes ago, the number of minutes past 2 o'clock was twice the number of minutes that it is now before 4 o'clock. How many minutes before 4 o'clock is it? Show and explain work

    asked by mark ,I need help
  249. General

    Does anyone know any good websites that show statistics for almost about anything??

    asked by Anonymous
  250. physics

    A person does 250 joules of work in pulling back the string of an archery bow. What is the initial speed of a 0.25-kilogram arrow the moment after it is fired from the bow?

    asked by Anonymous
  251. Algebra; MAJOR HELP

    Solve the equation. Provide an explanation please. s^2-7s+14=2

    asked by Ari
  252. Algebra

    -5r/x-9 - -8/x-9

    asked by Justin Su
  253. Chemistry

    If you can show me an example of one problem, I have no idea how to approach this. Calculate where the number 40.67 came from. Use the Clapeyron-Clausisus equation. Assuming that delta H vap does not change with temperature, this equation relates the

    asked by Angel
  254. pre-algebra

    zi drive 420 miles to visit her sister. after she had diven one-third of the way there, she stopped to eat lunch. how many miles did she have left to drive after lunch

    asked by nehila
  255. Calculus

    Find the derivative of f(x) = x^3

    asked by Labiba
  256. calculus

    How do I find the indefinite integral of cosx/(1-cos^2 x)dx?

    asked by Courtney
  257. Chemistry

    Cocaine is a non-electrolyte that has a molecular weight of 303.4 g/mole. How many grams must be dissolved in 25.0 mL of Chloroform (density = 1.484 g/mL) to raise its boiling point to 65.5 Celsius? The boiling point of pure Chloroform is 61.2 Celsius. Kb

    asked by Alyssa
  258. Math

    Divide 186 marbles between DON and ANDRE so that DON gets twice as many as ANDRE.:(

    asked by Alyssa
  259. chemistry

    how many grams of potassinum nitrate are produced from 81.6kg of potassinum chloride and 40.8 kg of hydrogen nitrate? 4KCl+4HNO3+O2------- 4KNO3+2Cl2+2H2O

    asked by rk
  260. physics

    4. An object is being lifted to the top of building by a light inextensible rope with a tension of 20 N at an acceleration of 1.4 m/s2. Neglecting air resistance, calculate the object’s mass.

    asked by Rai
  261. Algbera

    solve for the roots of the quadratic equation 2(x^2 - 4x + 5)=x^2 - x

    asked by omar
  262. math

    Explain if 2, 3 and 4cm could be side lengths of a right triangle.

    asked by pia
  263. nonfiction

    why was the nile so valuable for trade and transportation

    asked by zavier
  264. Science

    Suppose the moon were closer to Earth. How would the force of gravity between Earth and the moon be different?

    asked by Cassie
  265. PHYSICS

    A 25,000 kilogram train is traveling down a track at 20 meters per second. A cow wanders onto the tracks 75 meters ahead of the train, causing the conductor to slam on the brakes. The rain skids to a stop. If the brakes can provide 62,500 Newtons of

    asked by TRACY
  266. Calculus

    Use the first principles definition to differentiate y = 5x^2. Please show all your work!

    asked by Steph
  267. Global History

    what are the cultural diffusions between japan and korea

    asked by Anna
  268. ela <Ms.Sue>

    what does this quote from jean arp "Soon silence will have passed into legend. Man has turned his back on silence. Day after day he invents machines and devices that increase noise and distract humanity from the essence of life, contemplation, meditation"

    asked by erika
  269. nonfiction

    what items were found inside pyramids ?

    asked by zavier
  270. Serial Killers

    Could you maybe proofread over this essay I did on serial killers based on books I have read? Thanks! Jack The Ripper and Jeffrey Dahmer By:Bryce Screams and moans are heard all over the town as they unveil the corpse of Jack The Ripper's latest victim.

    asked by Bryce
  271. Math

    okay so the equation is -4.9t^2 - 39.2t + 1.6 If the rockets explode at the highest point (which max height is 80 meters) One of the rockets is schedules to explode 2 minutes and 28 seconds into the program. When should the rocket be fired from the barge?

    asked by Marisol
  272. nonfiction

    what were the accomplishments of queen hatshepsut?

    asked by zavier
  273. 8th grade math

    what is symbolic reasoning? Please help and explain. Thank you!

    asked by saranghae12
  274. math, geometry

    can a trapezoid have equal sized bases?

    asked by samantha
  275. math

    Make a subtraction number pattern so that the second number is 40. Fill in the blanks for the all 6 numbers.

    asked by Gabby ( 5 grade)
  276. Math

    r=40-2t shows the relationship between the average rate of speed, r, of a car in meters per second, and the time, t,in seconds, as the car slows down.

    asked by annie
  277. Chemistry

    (2.50mL)(0.10M) / 75.00mL = 0.003333 Im not sure how many sig figs to use. Would it 3.33e-3?

    asked by Hannah
  278. Chemistry(Please help)

    I have to convert 1 minute 25 seconds into just seconds. Im not sure what to do. Thank you!!

    asked by Hannah
  279. chemistry

    a large 1.5 x 10^6liter tank contains water polluted with lead (II) nitrate at a molarity concentraion of 2.5 x 10^-6 M to the tank, you add 59.7 liters of 0.075 M potasium chloride solution. did you add enough potassium chloride to remove all the lead(II)

    asked by tom
  280. Chemistry

    [H^+] = 2.7 x 10^-3 Calculate for [OH^-] [OH^-] = ? M

    asked by Matt
  281. Stats

    Explain how to calculate margin of error. What effect does increasing your sample size have on the margin of error? What effect does it have on the confidence level? What effect does it have on the confidence interval?

    asked by Ashley
  282. chemistry homework help!!

    if you have 380.0mL of water at 25.00 degrees Celsius and add 140mL of water at 95.00 degrees Celsius, what is the final temperature of the mixture? Use 1.00 g/mol as the density of water.

    asked by danielle
  283. business studies

    discuss the legal and enthical constrains expressed by businesses in zimbabwe.

    asked by 389389
  284. Language Arts

    Need help figuring out which word goes in the blank out of this, that, these, or those. The sentence is: "Let's exchange __________ bread for these crackers." I know it is not these or those but not sure between this or that. Thanks...

    asked by Brandi
  285. ENGLISH-PLEASE HELP!

    In Dante's inferno, why does Dante have to get rid of his feelings of sympathy and pity toward sin and sinners in order to grow?

    asked by Karen
  286. Neuroscience

    compare ionotropic and metabotropic receptor channels in both structure and function

    asked by Laci
  287. neuroscience

    discuss spatial and temporal summation

    asked by hannah
  288. neuroscience

    discuss Clostridium Botulism and Clostridium Tetanus, and how they interfere with SNARE proteins.

    asked by brent
  289. PHYSÝCS please help

    The position of a particle moving along the x-axis is given by x = 3.49t2 – 2.21t3, where x is in meters and t is in seconds. What is the position of the particle when it achieves its maximum speed in the positive x-direction? ý need only final

    asked by MARÝA
  290. college algebra

    Given f(x) = sqrt of x+4 and g(x) = 1/x find (gof)(x).

    asked by Missy
  291. college algebra

    Write in y=mx+b form the line perpendicular to 5x-y=2 passing through (10,-2)

    asked by Missy
  292. Calculus

    Find the derivative of f(x) = x^3 Show all the work please and thank you!

    asked by Steph
  293. Chemistry(Please check)

    (0.80M)(5.00mL) = c2 (75.00mL) c2 = 5.33e-2 M Is the correct amount of sig figs?

    asked by Hannah
  294. alg 2

    The width of a rectangular field is 8 feet shorter than its lenght, if l represents lenigh, write an eguation in terms of l for the perimeter of the field?

    asked by hailey
  295. science

    what could you conclude about the two rock layers if paleontologists would find a trilobite fossil in a rock layer at the top of a hill in South America, then find the same kind of fossil in a rock layer at the bottom of a cliff in Africa

    asked by cassie
  296. Chemistry

    These are what i used. 0.0375M sodium thiosulphate , 2.5% KI .47.2 ml copper sulphate solution. the average volume of Na2S2O3 is 19.25 cm, i have already calculated the number of moles of thiosulphate which is 7.218 * 10-4 moles of Na2S2O3 and also the

    asked by Sarah
  297. phys4

    A hang glider moving at speed 9.0 m/s dives to an altitude 4.2 m lower. Ignoring drag, how fast is it then moving?

    asked by opp
  298. Please help me with M1 kinematics!

    A particle p is initially at the point (2, 6) in relation to an origin O, and is moving with velocity (3i + j) m/s. It has a constant acceleration (16i + 24j)m/s^2. Show that after 2 seconds it is moving directly away from O and find its speed at that time

    asked by Jat