Questions Asked on
March 25, 2012

  1. Math-

    A ball is thrown vertically upward with an initial velocity of 96 feet per second. The distance s (in feet) of the ball from the ground after t seconds is s(t)=96t-16t^2 a.) at what time will the ball strike the ground b.) for what time t is the ball more

    asked by danielle
  2. precal- PLEASE HELP!

    secx/secx-tanx=sec^2x+ secx+tanx

    asked by olivia
  3. Chemistry

    Write the acid-dissociation reaction of nitrous acid (HNO2) and its acidity constant expression.

    asked by Lisa
  4. chemistry- electrochemical cell

    What makes this an oxidation-reaction? 3Ag2S+2Al(s) -> Al2S3+6 Ag(s)? Write the half-reactions showing the oxidation and reduction reactions. Identify which is the oxidation reaction and which is the reduction reason. What is oxidized in the reaction? What

    asked by princess
  5. Chemistry

    The reaction: H2PO4- + HAsO42 ---> HPO4- + H2AsO4- Which one of the sets above lists both of the base species involved in the equilibrium? I'm confused and couldn't identify the conjugate acids and bases properly. Could Dr.Bob explain abt this problem ?

    asked by Swaastikaa
  6. statistics

    The number of pizzas consumed per month by university students is normally distributed with a mean of 9 and a standard deviation of 5. What is the probability that in a random sample of size 10, a total of more than 80 pizzas are consumed? (Hint: What is

    asked by Lucy
  7. Physics

    A 60kg front seat passenger in a car moving initially with a speed of 18m/s (40 MPH) is brought to rest by an air bag in a time of 0.4s a. What is the impulse acting on the passenger? b.What is the average force acting on the passenger in this process?

    asked by Karien
  8. personal finance

    Alison's car is valued at $14,000, and she owes $12,000 on it. What is her current equity?

    asked by Lamar
  9. chemistry

    If all the energy obtained from burning 1.23 pounds of propane (fuel value is 11.09 kcal/g) is used to heat 125.0 kg of water at an initial temperature of 21.8 °C, what is the final temperature? Hint: The heat, q, released by burning propane is absorbed

    asked by Yasha
  10. chemistry

    Suppose that you place exactly 100 bacteria into a flask containing nutrients for the bacteria and that you find the following data at 37 °C: TIme (s) number of bacteria 0 100 19 200 38 400 57 800 76 1600 what is the rate order? What is rate constant? how

    asked by HELP PLEASE
  11. Calculus

    A function f is defined on the interval [0,4], and its derivative is e^sinx-2cos3x a. on what interval is f increasing? b. at what value(s) of x does f have a local maxima? c. how many points of inflection does f have? *calculator is allowed for this

    asked by Anonymous
  12. physics

    A 4.5 cm tall object is placed 20 cm in front of a spherical mirror. It is desired to produce a virtual image that is upright and 3.5 cm tall. (a) What type of mirror should be used? concave mirror convex mirror (b) Where is the image located? (Your answer

    asked by Tom
  13. spanish

    Yo ______ lavo ______ manos y ______ cara. ______ cepillo ______ dientes y ______ cepillo ______ pelo. Yo ______ pongo ______ ropa.

    asked by jack
  14. calculus

    A searchlight rotates at a rate of 4 revolutions per minute. The beam hits a wall located 9 miles away and produces a dot of light that moves horizontally along the wall. How fast (in miles per hour) is this dot moving when the angle between the beam and

    asked by Anonymous
  15. chemistry

    The solubility products of AgBr and Ag3PO4 are 5.0 10-13 and 1.8 10-18, respectively. If Ag+ is added (without changing the volume) to 1.00 L of a solution containing 0.31 mol Br ‾ and 0.31 mol PO43-, calculate the molarity of Ag+ ions required to

    asked by Tanner
  16. Chemistry

    How do you prepare a 0.4 M soultion of copper sulfate in water starting with solid copper sulfate and water?

    asked by Amanda
  17. college physics

    A 0.50-kg block slides along a small track with elevated ends and a flat central part. The flat part has a length L = 1.85 m. The curved portions of the track are frictionless, but for the flat part the coefficient of kinetic friction is 0.103. The block

    asked by jerry
  18. Physics

    A rifle with a mass of 1.2 kg fires a bullet with a mass of 6.0 (0.006kg). The bullet moves with a muzzle velocity of 600 m/s after the rifle is fired. a. What is the momentum of the bullet after the rifle is fired? b. If external forces acting on the

    asked by Jeremiah
  19. Math

    A function f is defined on the interval [0,4], and its derivative is e^sinx-2cos3x a. on what interval is f increasing? b. at what value(s) of x does f have a local maxima? c. how many points of inflection does f have? *calculator is allowed for this

    asked by Anonymous
  20. physics

    A 3.00x10^-3 kg lead bullet enters a target with a speed of 2.00x10^2 m/s and comes to rest within the target. Calculate the rise in temperature of the bullet assuming that 80.0% of the heat produced is absorbed by the bullet. The Specific heat of lead is

    asked by Elizabeth
  21. physics

    A 1.75-kg wooden block rests on a table over a large hole as in the figure below. A 4.60-g bullet with an initial velocity vi is fired upward into the bottom of the block and remains in the block after the collision. The block and bullet rise to a maximum

    asked by jeezy
  22. Biology

    When you measure your heart rate for less than 20 seconds , why is it less possible for the results to be reliable? When you measure your heart rate for more than 20 seconds, why is it still less possible for the results to be reliable?

    asked by Shaman
  23. Physics

    Tom the train and Dan are involved in an elastic collision. A 2.5 kg Tom is, at rest but is approached head-on by a 5.0 kg Dan moving at 0.60 m/s. The force-separation graph for the ensuing collision is given: the picture of the graph is found here:

    asked by Nick
  24. Statistics

    Computer Depot is a large store that sells and repairs computers. A random sample of 110 computer repair jobs took technicians an average of 93.2 minutes per computer. Assume that o is known to be 16.9 minutes. Find a 99% confidence interval for the

    asked by Jasmine
  25. Chemistry

    use the Ksp of SnS2= 1.0X10^-70 and calculate the pH of a hydrogen sulfide solution needed to precipitate 99.99% of the tin(IV) ion assuming [Sn^4+]=0.05M and that [H2S]=0.10M.

    asked by Tanner
  26. Statistics

    The average annual salary of employees at Wintertime Sports was $28,750 last year. This year the company opened another store. Suppose a random sample of 18 employees had an average annual salary of $25,810 with standard deviation of s = $4230. Use a 1%

    asked by Jasmine
  27. Calculus

    Given the function f(x)= e^2x(x^2-2) a. does the decreasing arc reach a local or global minimum? b. does f have a global max?

    asked by Anonymous
  28. Math

    Given the function f(x)= e^2x(x^2-2) a. does the decreasing arc reach a local or global minimum? b. does f have a global max?

    asked by Anonymous
  29. chemistry

    Many reaction involving heterogeneous catalysts are zeroth order, that is rate=k. An example is the decomposition of phosphine (PH3) over tungsten (w): 4Ph3---> P4 + 6H2 It is found That the reaction is independent of PH3. As lon 1 g as phosphine's

    asked by court
  30. physics

    According to newtons 1st law , construction workers are warned not to leave their hard hats on the rear window ledge of their cars, explain why?

    asked by Melissa
  31. Physics

    A bucket of water with a mass of 4.0 kg is attached to a rope that is wound around a cylinder. The cylinder has a mass of 8.0 kg and is mounted horizontally on frictionless bearings. The bucket is released from rest. (a) Find its speed after it has fallen

    asked by Priyanka
  32. math

    Amy has a cube numbered 1 through 6. If she rolls the cube 30 times, how many times can she expect to roll a multiple of 3?

    asked by stumped
  33. calculus

    1. A solid is constructed so that it has a circular base of radius r centimeters and every plane section perpendicular to a certain diameter of the base is a square, with a side of the square being a chord of the circle. a. Find the volume of the solid. b.

    asked by Yuri
  34. English

    . In which one of the following sentences ia an abbreviation used correctly? A. I had to go to the Dr. on Monday B. Martin is a member of Parents for Responsible Teens (PRT) C. His birthday is Sept 28. D. Keep the bandage on for at least 3 hrs. Answer (b)

    asked by Brenna
  35. Algebra 2

    The concentration of hydrogen ions in a batch of homemade ketchup is 10-4,. What is the pH level of the ketchup?

    asked by Mary
  36. Algebra

    A movie theater manager wants to know how many adults and how many children pay admission to a particular movie. The theater charges $10.00 for adult tickets and $5.00 for child tickets. At a showing where 210 tickets were sold the theater collected

    asked by Katy
  37. Statistics

    Mr. Crandall has assigned a term paper due at the end of the semester. He would like to know the average length of the papers. The data below are the he numbers of types pages from a random sample of 10 term papers. Use these data to compute a 95%

    asked by Jasmine
  38. Physics

    How large must the coefficient of static friction be between the tires and the road if a car is to round a level curve of radius 85 m at a speed of 95 km/h?

    asked by Kristina
  39. Physics

    A playground merry-go-round made in the shape of a solid disk, has a diameter of 2.63 m and a mass of 353.9 kg. Two children, each of mass 30.5 kg, sit on opposite sides at the edge of the platform. Approximate the children as point masses. (a) What torque

    asked by Adam
  40. criminal justice

    Options Menu: Forum Topic: Interpreting the U.S. Constitution Consider the following scenario: The Supreme Court interprets the U.S. Constitution. Thomas Jefferson once argued against the doctrine of judicial review. He believed in the principles of

    asked by Lisa
  41. chemistry

    The activation energy for the decomposition reaction, 2 HI---> H2 + Hi Is 186 kj/mol. The rate at 555 k is 3.2 x 10 -7L/mol. Sec. What is the rate at 645 k

    asked by court
  42. chemistry

    2- A 0.310 M solution of a weak acid, HX, has a pH of 2.53 a. Find the [H+] and the percent ionization of nitrous acid in this solution. b. Write the equilibrium expression and calculate the value of Ka for the weak acid. c. Calculate the pH of the

    asked by bob
  43. Physics

    trap door of length and width 1.65 m is held open at an angle of 65.0 degree with respect to the floor. A rope is attached to the raised edge of the door and fastened to the wall behind the door in such a position that the rope pulls perpendicularly to the

    asked by Lorax
  44. physics

    A jet plane pilot decides to accelerate horizontally. If the thrust of the engine is increased to 50 000 N at a time when the air resistance ( or drag) acting on the 4000kg plane amounts to 30 000 N , what will the planes acceleration be I believe you at

    asked by Melissa
  45. Physics

    (a) A 2.20 cm high insect is 1.24 m from a 135 mm focal-length lens. What is the image distance? mm How high is the image? cm What type is it? (Select all that apply.) The image is upright. The image is inverted. The image is behind the lens. The image is

    asked by Anna
  46. calculus

    4. A particle starts at the point (5, 0) at t = 0 and moves along the x-axis in such a way that at time t > 0 the velocity is given by v(t)=t/(1+t^2) a. Determine the maximum velocity attained by the particle. Justify your answer. b. Determine the position

    asked by Tiffany
  47. Chemistry

    What volume of hydrogen gas measured at 27celcius and 723 torr may be prepared by the reaction of 8.88 grams of gallium with an excess of hydrochloric acid? Ga+ HCl ==> GaCl3 + H2

    asked by Anonymous
  48. Physics

    At a city park, a person throws some bread into a duck pond. Two 4.00-kg ducks and a 9.00-kg goose paddle rapidly toward the bread, as shown in our sketch (Intro 1 figure) . If the ducks swim at 1.10 m/s, and the goose swims with a speed of 1.30 m/s, the

    asked by William
  49. chem

    Butadiene can undergo the following reaction To form a dimer(two butadiene molecules hooked together). 2c4h8---->c8h12. The half life for the reaction at a given temperature is 5.92x10-2 sec. The reaction kinetics are second order. 1. If the initial

    asked by court
  50. physics

    Find the number of atoms in a gold ring of mass 6.43 g.

    asked by cindy
  51. physics

    A woman pushes a refrigerator across the floor at a steady speed of 20cm/s . If she has to push with a horizontal force of 400 N to keep it moving , is the force of friction less than 400 N , 400 N, more than 400 N, why

    asked by Melissa
  52. physics

    a person attaches a 25kg hay bale to one end of a rope passing over a frictionless pulley connected to a beam in the hay barn. another person then pulls down on the opposite end of the rope with a force of 277-N Ignoring the mass of the rope what will be

    asked by Kelsey
  53. Algebra

    Alice travels 6 times faster than Bill. Traveling in opposite directions, they are 714 miles apart after 6 hours. Find their rates of travel.

    asked by Shannon
  54. physics

    When the crampton coal-fired train engine was built in 1852 , its mass was 48.3t ( 1.0 t= 1.0*10^3) and its force capability was rated at 22.4 kN. Assuming it was pulling train cars whose total mass doubled its own was and the total friction on the engine

    asked by Melissa
  55. Physics

    A convex mirror forms an image of height of 2.4 cm, If the radius of curvature of thr mirror is 40 cm, find the heihgt and distance of the object from the mirror.

    asked by Lafix erassy
  56. physics

    A train is moving parallel to a highway with a constant speed of 16.0 m/s. A car is traveling in the same direction as the train with a speed of 36.0 m/s. The car horn sounds at a frequency of 504 Hz, and the train whistle sounds at a frequency of 314 Hz.

    asked by Anonymous
  57. physics

    How much applied force is needed to accelerate a 2.0 kg block of wood at 4.0m/s^2 along a rough table, against a 10 N force of friction?

    asked by Melissa
  58. ap physics

    A 650N man jumps out of a window into a fire net 8m below. The net stretches 1.5m before bringing the man to rest and tossing him back into the air. What is the maximum potential energy of the net compared to its unstretched potential energy?

    asked by Stephen
  59. Physics

    In the dangerous "sport" of bungee-jumping, a daring student jumps from a balloon with a specially designed elastic cord attached to his waist, as shown in Figure P5.77. The unstretched length of the cord is 25.0 m, the student weighs 675 N, and the

    asked by andrew
  60. COLLEGE ALGEBRA

    An investment of $63,000 was made by a business club. The investment was split into three parts and lasted one year. The first part of the investment earned 8% interest, the second 6% and the third 9%. Total interest from the investments was $4950. The

    asked by AMBER
  61. Math

    Maya bought a car for $15,000. To pay for it, she took a bank add-on interest loan at an annual interest rate of 9%. The loan term is 5 years. How much interest will she pay and what are her monthly payments?

    asked by Dee
  62. Physics

    A 15 kg child stands on the edge of a small merry-go-round of radius 2.0 m. If the merry-go- round turns at a steady rate of 11 rpm, calculate the magnitude and direction of the net force on the child.

    asked by Kristina
  63. algebra

    you can paint a room in 8 hours. your friend and you can paint a room in 5 hours together. how long does it take your friend alone?

    asked by Anonymous
  64. physics

    A jet plane is traveling at a constant speed in a straight line in level speed. What does this tell you about the forces acting on it, what forces are acting on it .

    asked by Melissa
  65. physics

    A 1200 kg boat accelerates steadily at 0.05 m/s^2 in a straight line . Are the forces on this boat balanced or unbalanced?

    asked by Melissa
  66. Chemistry

    I don't get this at all. A beaker with 105mL of an acetic acid buffer with a pH of 5.00 is sitting on a bench top. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 8.40 mL of a 0.470 M HCl solution to the beaker. How

    asked by Amanda
  67. Chemistry

    how do I find the pH of a buffer solution given that 0.010M NH3 mixed with 0.0030M NH4Cl. Also... a 0.010M HF solution is mixed with 0.030M KF. FIND THE pH of this mixed solution.

    asked by Declan
  68. Chemistry

    help...If exactly 5.0 mL of HNO3 will neutralize 15 mL of 2.0 M NaOH, what is the molarity of the HNO3 solution? Have no idea what to do. thank you.

    asked by Brad
  69. Finance

    A 20-year, $1,000 par value bond has a 9% annual coupon. The bond currently sells for $925. If the yield to maturity remains at its current rate, what will the price be 5 years from now

    asked by Lola
  70. Statistics

    A random sample of 14 evenings at the O'Sullivan house hold showed that the family received an average of 2.4 solicitation calls each evening. The sample standard deviation was s= 0.9. Find a 99% confidence interval for the population mean number of

    asked by Jasmine
  71. Statistics

    Long term experience showed that after a type of eye surgery, recovery time has a mean of u = 5.3 days in a hospital. A random sample of 40 patients, with this type of eye surgery, were treated as outpatients during recovery and the sample mean recovery

    asked by Jasmine
  72. chemistry

    Calculate the pH range required to separate 99.99% of Cr3+ from Zn2+ by precipitation of Cr(OH)3(s) in a solution that is initially 0.034 M in both Cr3+ and Zn2+. Use the Ksp values from Table 16.2 of Chang and calculate the pH to the nearest 0.01 pH unit.

    asked by Tanner
  73. Physics

    trap door of length and width 1.65 m is held open at an angle of 65.0 degree with respect to the floor. A rope is attached to the raised edge of the door and fastened to the wall behind the door in such a position that the rope pulls perpendicularly to the

    asked by Lorax
  74. precal

    1/tanx-secx+ 1/tanx+secx=-2tanx so this is what I did: =tanx+secx+tanx-secx =(sinx/cosx)+ (1/cosx)+(sinx/cosx)-(1/cosx) =sinx/cosx+ sinx /cosx= -2tanxI but I know this can't be correct because what I did doesn't end as a negatvie:( please help

    asked by olivia
  75. Math

    What positive value of b makes 9^2-bx+4 a perfect square trinomial? How would you solve this problem? Thanks

    asked by Shadow
  76. chemistry

    A 600ml sample of a saturated solution of MgCO3 is reduced to 125 ml by evaporation. What mass of MgCo3 is formed? Ksp=4*10^-5

    asked by maureen
  77. statistics

    A person can order a new car with a choice of 9 possible colors, with or without ac, with or without heated seats, with it without anti lock breaks, with or without power windows and with or without a CD player. How many different ways can a new car be

    asked by Sabrina
  78. Physics

    A wheel's uniform angular acceleration is constant. Initially its angular velocity is zero. During the first 1.0 s time interval, it rotates through an angle of 90.0°. (a) Through what angle does it rotate during the next 1.0 s time interval? (b) Through

    asked by Adam
  79. Spanish

    Fill in the blank. 1. Los amigos están viajando por un país europeo. Los amigos están viajando por _____________________. 2. Están haciendo un viaje que no cuesta mucho. Están haciendo un viaje _______________. 3. Lo están pasando muy bien. Se

    asked by Ren
  80. chemistry-balanced redox equations

    Use the following steps to balance the redox reaction below: Mg + Au+ Mg2+ + Au a. Write the oxidation and reduction half-reactions. Make sure each half-reaction is balanced for number of atoms and charge b. Multiply each half-reaction by the correct

    asked by princess
  81. physics

    Find the mass in grams of a carbon dioxide molecule.

    asked by cindy
  82. physics

    A 1-kg mass (the blue mass) is connected to a 8-kg mass (the green mass) by a massless rod 67 cm long, as shown in the figure. A hole is then drilled in the rod 40.2 cm away from the 1-kg mass, and the rod and masses are free to rotate about this pivot

    asked by hania
  83. Algebra

    Josh and Racquel sold cookies and brownies at the math club bake sale. The cookies cost $0.47 each, and the brownies cost $0.60 each. They sold a total of 603 items (cookies and brownies) and raised $323.84 Write a system of equations and determine the

    asked by Katy
  84. Algebra

    Mark made a business trip of 290 miles. He averaged 56 mph for the first part of the trip and 60 mph for the second part. If the trip took 5 hours, how long did he travel at each rate?

    asked by Shannon
  85. Chemistry

    The following system is at equilibrium,at 699K in a 5L container. H2(g)+I2(g)--->2HI(g) Kc = 54.9 Initially,the system had 2.50 moles of HI.What is the moles of H2 at equilibrium? Can Dr.Bob check if my steps are correct? My solution: Initially,the

    asked by Swaastikaa
  86. Physics

    If you are wearing contact lenses with a dioptric power of 3.4 and your eye has a diameter of 2.6 cm, what is the effective focal length of your eye-contact lens combination, in centimeters?

    asked by Morgan
  87. Chemistry

    Consider the HF solution with the concentration 5%(w/v). Calculate its concentration in the molarity. Use four significant figures in the answer.

    asked by Lisa
  88. Chemistry

    At equilibrium, it was found that [CH3COOH] = 0.8537 M, [CH3COO-] = 0.0040 M, and [H3O+] = 0.0040 M. Calculate the acidity constant of CH3COOH and the pH value of the solution. - Please show how you solve the problem.

    asked by Lisa
  89. Chem 111

    A solution is prepared by mixing 499 mL of 0.19 M Tris·Base and 592 mL of 0.37 M Tris·Acid. What is the pH of this solution? [Ka(Tris·Acid) = 8.5 × 10-9] Round your answer to two places past the decimal. I can do basic pH questions but I am at a loss

    asked by Brittany
  90. math

    The space station is going 17500 mph as it orbits the earth. How long will it take to orbit 1 time if the earths diameter is 7926 miles and the space station orbits at 240 miles above the earth.

    asked by Bob
  91. math pre calc

    solve for x. 8^6+3x=16

    asked by danielle
  92. Statistics

    A large furniture store has begun a new ad campaign on local television. Before the campaign, the long term mean daily sales were $24,819. A random sample of 40 days during the new ad campaign gave a sample mean daily sale of $25,910. Does this indicate

    asked by Jasmine
  93. chemistry

    Both Fe2+ and Cd2+ are precipitated by sulfide. However, they can be quantitatively separated through pH adjustment. You are given a solution containing 0.086 M Fe2+ and 0.062 M Cd2+. Calculate the [H+] range for a saturated H2S solution (ie, [H2S]=0.10 M)

    asked by Tanner
  94. English

    Writeacher, here are the sentences I urgently need you to check. 1)Though you are still a student, refer to the type of approach to work you may adopt when working. Would you work at a job, at a career, or at a passion? 2) Write at least five phrasal verbs

    asked by Matthew
  95. science

    Which of the following would most likely cause rising air? A warm air and low pressure B cold air and low pressure C warm air and high pressure D cold air and high pressure Please give us the answer.

    asked by miki
  96. Algebra

    Solve the system of equations by substitution. Your answer should be given as an ordered pair like this (x, y). Round your answers to the nearest tenth. y=-2+7x 10x-7y=209

    asked by Katy
  97. Math

    scientific notation 12,150,000,000 1.215 x 10(7)

    asked by Cathy
  98. Algebra

    If 3 is subtracted from the numerator of a certain fraction, the value becomes 2/3. If 10 is added to the denominator of the original fraction, the value becomes 1/2. Find the original fraction. Solve the problems by using 2 variables HOW DO I START THIS

    asked by BIBIN
  99. English

    I need help writing a story using these words. Any Ideas? 1.impute-- (v) to attribute an action to particular person or group 2.incompatible-- (adj) opposed in nature, not able to live or work together 3.inconsequential-- (adj) unimportant, trivial

    asked by Anonymous
  100. Math

    JJ's boat will go 15 mph in still water. If he can go 12 mph downstream in the same amount of time it takes to go 9 mph upstream, what is the speed of the current?

    asked by Sarah
  101. geometry

    During the half-time show of a football game, a trumpet player and a tuba player start at the same position on the field. The trumpet player then marches 74.8 ft directly toward the goal line, and the tuba player marches directly toward the sideline. At

    asked by monique
  102. English

    When preparing a formal business presentation the phase that can make or break your report is the ----phase. A. writing B. outline C. revision D. organization Answer (c )

    asked by Brenna
  103. chemistry

    How do I do a question like this please help and explain it!! Calculate the pH of a buffer solution that contains 0.22 M benzoic acid (C6H5CO2H) and 0.24 M sodium benzoate (C6H5COONa). [Ka = 6.5 × 10-5 for benzoic acid] Round your answer to two places

    asked by Brittany
  104. Chemistry

    I will do an experiment that includes 4 grams of aluminum hydroxide and iron (III) oxide mixture, where 75% of it is Al(OH)3, and 15 ml of water and 25 ml of 2M KOH will be added and then boiled so that the Al(OH)3 dissolves. It will be filtered and then

    asked by Tiffany
  105. English

    I have starr test in the morning can somebody please explain what the difference between literary and expository writing

    asked by Amanda
  106. AP Calc

    If y=2x-2 , what is the minimum value of the product xy? A. -16 B. -8 C. -4 D. 0 E. 2

    asked by Yuri
  107. Chemistry

    How many mL of 5.5 M KOH are needed to prepare 300 mL of 0.2 M KOH?

    asked by Amanda
  108. statistics

    Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more? Why or why not?

    asked by Lea Kellogg
  109. math

    23+43

    asked by priya
  110. LANGUAGE

    a) the singing of one's name _ _ _ _ ture b) the time to leave _ _ _ _ _ ture c) silly, not acting of one's age _ _ _ _ture I swear I found all of them except these three

    asked by flower
  111. Physics

    What is the wavelength of light (in nanometers, nm) emitted when the electron in a hydrogen atom moves from the n=5 energy level to the n=3 energy level?

    asked by Morgan
  112. Chemistry

    Calculate the concentration of the hydronium ion([H3Ol+]) for a solution with the pH = 4.5

    asked by Lisa
  113. child psychology

    which young adult is at risk of long-term identity foreclosure or diffusion A.An aspiring chef who has no ooportunity for culinary training. B. A peace corps volunteer.

    asked by sarah
  114. child psychology

    Dean associates certain activites,roles, and traits as being typical for either males or females.His associations conform to cultural stereotypes and encompass many gender-linked responses.This is an example of gender: A.atypicality B.roles C.typing

    asked by sarah
  115. physics

    1. Temperature is distinguished from heat when we note that whereas temperature is ____________________. A) None of these.B) measured in degrees, heat is measured in units of energy.C) a measure of average translational kinetic energy per molecule, heat is

    asked by Kristie
  116. English

    Thank you very much. I left out a few sentences I'm unsure of. 1) My school is not close enough for me to walk there. My school is too far for me to walk there. (Shall I include there in both sentences). 2) I didn't have enough time to visit her yesterday.

    asked by Matthew
  117. physics

    An 73-kg bungee jumper is enjoying an afternoon of jumps. The jumper's first oscillation has an amplitude of 14 m and a period of 6 s. the spring constant of the bungee cord is 80.1 and max speed during oscillation is 14.7 m/s Treating the bungee cord as a

    asked by hania
  118. math

    The diameter of each tire on Niki's bike is 66 centimeters (cm). It takes her 16 minutes to ride 10 kilometers (km). How fast did Niki ride, in kilometers per hour?

    asked by jenna
  119. pharmacology

    which is the least accurate system for measuring medicine?

    asked by stephanie
  120. fun facts

    what are some fun facts on multitasking? if not that what are some websites to find good fun facts

    asked by Samantha
  121. physics

    A 1-kg mass (the blue mass) is connected to a 9-kg mass (the green mass) by a massless rod 67 cm long, as shown in the figure. A hole is then drilled in the rod 40.2 cm away from the 1-kg mass, and the rod and masses are free to rotate about this pivot

    asked by hania
  122. math problem

    please help to solve find x intercept of f(x)4x+x(x-1)=0

    asked by Lavern
  123. physics

    The temperature at the bottom of Lake Tahoe in the Sierra Nevada Mountains of California is 4°C year round. In which country is water at the bottom of lakes normally higher than this? A) Russia.B) Great Britain.C) New Zealand.D) Tibet.E) Singapore.

    asked by Kristie
  124. biology

    a class of pupils obtained results on a bar chart during a seashore investigation. they sampled the numbers of different seaweeds found in 0.25 m2 from the top shore (upper shore) to lower shore and found average percentage cover for each seaweed. describe

    asked by jane
  125. Math

    1. Simplify, and write in the base of 3: (9^x . 3^4x)^2 answer: 3^12x 2. Differentiate and simplify a. y= 3x^4 - 4e^x + 8 answer: 4(3x^3 - e^x) b. y= (3 + 4e^x)^5 answer: 20e^x (3+ 4ex)^4 c. y= (e^x - 1) / x^2 answer: (xe^x - 2e^x +2) / x^3

    asked by Help-please check
  126. PSYCHOLOGY

    Please help me understand. Explain boundary theory and provide an example.

    asked by CHASEONE
  127. algebra

    x+y=38; x-y=26-x

    asked by Susan
  128. chemistry

    how much aluminum oxide is needed to produce 1 kg of aluminum?

    asked by jupta
  129. english

    How can you resolve conflict whilst working in the community

    asked by Lisa
  130. precal

    1-cosx/1+cosx=(cotx-cscx)^2

    asked by olivia
  131. math

    what is the absolute value of -|6^2| would it be -36?

    asked by jocelyn
  132. calculus

    Evaluate the integral ∫∫∫2xzdV bounded by Q. Where Q is the region enclosed by the planes x + y + z = 4, y = 3x, x = 0, and z = 0. Answer=16/15 Is this answer correct? cause i've tried doing this problem a bunch of ways and i never even get close to

    asked by Brandon
  133. calculus

    find F(x)' for x^3(3-x)^4.. i think answer is 3x^2(3-x)(3-3x)^4.. please help thanks

    asked by Rochelle F
  134. English

    Thank you very much. Here are a few sentences I urgently need you to check. 1) I wish it hadn't rained so often. I wish they would stop arguing (with each other) 2) I wish she were here with me. If I had studied harder, I would/could/might have passed the

    asked by Matthew
  135. algebra

    If a gardener can mow a lawn in 25 min, what portion of the lawn can the gardener mow in 1 min?

    asked by Anonymous
  136. accounting

    Part 5 Cash Budgeting Landis Company has the following sales forecasts for the selected three-month period in the current year: Month Sales April $12,000 May 7,000 June 8,000 Seventy percent of sales are collected in the month of the sale, and the

    asked by beth
  137. calculus

    1. Consider the function f(x) = X^(4/3) +4x^(1/3) on the interval -8 ≤ x ≤ 8. a. Find the coordinate of all points at which the tangent to the curve is a horizontal line. b. Find the coordinate s of all points at which the tangent to the curve is a

    asked by Yuri
  138. science fair

    in my science fair report school layout they want us to write a paragraph on testing my hypothesis and before that they asked us to write the procedure. i wrote the procedure now do i rewrite it for testing my hypothesis? or do i write something else

    asked by Samantha
  139. English

    Could you please check my sentences, please? Thank you, Writeacher. 1) You can't get out of it: you must confess that you have broken the vase. We were having dinner when the lights went out. 2) The teacher invited me to look up the unknown words in the

    asked by Matthew
  140. Algebra

    A ball is thrown up with an initial velocity of 32 feet per second. How many seconds will it take for the ball to return to the ground using the formula h=vt-16t^2?

    asked by Zach
  141. Religion

    What is a good way to define a totem pole?

    asked by Rebecca
  142. 11th grade math

    A farmer wants to fence in 60 000m^2 of land in a rectangular field along a straight road. The fencing that he plans to use along the road is $10 per meter and the fencing that he plans to use for the other three sides costs $5 per meter. a) How much of

    asked by jenna
  143. physics

    A bug that has a mass mb = 1 g walks from the center to the edge of a disk that is freely turning at 38 rpm. The disk has a mass of md = 11 g. If the radius of the disk is R = 30 cm, what is the new rate of spinning in rpm?

    asked by katie
  144. physics

    A cylinder of mass M=58 kg, radius R=1.3 m and moment of inertia I=(1/2)MR2 is initially rotating around its central axis with an angular velocity ωi= 1.8 rad/s. A tangential force F of constant magnitude applied to the edge of the cylinder during 5.9 s

    asked by katie
  145. physics

    A spool of thin wire pivots on a shaft with friction. The wire is pulled by a hanging mass M=1.50 kg. Upon starting from rest and falling a distance D=1.65 m, the mass has a speed V=2.00 m/s. Calculate the energy lost to friction during that time. Inner

    asked by please help:)
  146. Statistics

    How long does it take to have food delivered? A Chinese restaurant advertises that the mean delivery will be no more than 30` minutes. A random sample of delivery times is shown below. Based on this sample data, is the mean delivery time different than 30

    asked by Jasmine
  147. physics

    When the crampton coal-fired train engine was built in 1852 , its mass was 48.3t ( 1.0 t= 1.0*10^3) and its force capability was rated at 22.4 kN. Assuming it was pulling train cars whose total mass doubled its own was and the total friction on the engine

    asked by Melissa
  148. math

    2cos^2a*cos^2b+2sin^2asin^2b-1=cos2acos2b how to prove it,please help me

    asked by A.L
  149. Math

    (4.44e-2 - x) (8.06e-2 - x) / (0.331 + 2x)^2 = 1.80e-2 I need to rearrange this equation so that I can get a,b, and c, for the quadratic equation but I am not sure how to do this. Thank you for the help. Math(Please answer, thank you) - bobpursley, Sunday,

    asked by Hannah
  150. Chemistry

    I have 2 questions on columns used in the Gas Chromatography-Flame Ionisation Detector (GC-FID) instrument: - 1) If a capillary column is left in the GC-FID instrument for 2 months with the instrument switched off (i.e. instrument is not in use),will this

    asked by mandy
  151. AIU

    You are the lead human–computer interaction (HCI) engineer on a major defense project supporting the government and its integration of a new system and application design for use by federal investigators. Part of your job is to elicit and define the user

    asked by ronald
  152. calculus

    1. Consider the function f(x) = X^(4/3) +4x^(1/3) on the interval -8 ≤ x ≤ 8. a. Find the coordinate of all points at which the tangent to the curve is a horizontal line. b. Find the coordinate s of all points at which the tangent to the curve is a

    asked by Yuri
  153. Criminal Justice

    If judicial review were eliminated, what alternative means could be used to interpret the meaning of the Constitution?

    asked by Lisa
  154. Physics

    A helicopter winches up an injured person from a boat. The person plus equipment has a mass of 104 kg. If the height of the lift is 84 m and it is carried out at a uniform rate over 70 s, what is the power expended by the helicopter's winch motor? Assume

    asked by Anonymous
  155. physics

    The force on a wire is a maximum of 6.00\times 10^{ - 2} {\rm{N}} when placed between the pole faces of a magnet. The current flows horizontally to the right and the magnetic field is vertical. The wire is observed to "jump" toward the observer when the

    asked by ben
  156. Religon

    Unscrable mastcrane

    asked by Linda
  157. physics

    If we were to find advanced life on a planet which orbited reasonably near to a star of temperature 30000 Kelvin, to what wavelength of radiation (measured in nanometers, nm) might we reasonably predict their eyes would be most sensitive?

    asked by Morgan
  158. Physics

    What is the total power, or radiant flux, (in megawatts) of a spherical object of temperature 873 K and radius 7 meters, if we assume that it radiates like a perfect blackbody? (To get an answer in megawatts, take your answer in watts and divide by a

    asked by Morgan
  159. physics

    If a more complicated atom has two energy levels for its electrons at (-15) eV and (-30.1) eV, what is the wavelength of the photon (in nm) that is emitted when an electron transitions between these two levels?

    asked by Morgan
  160. TEC/401

    HOW the internet policies of some countries may effect a company's ability to expand globally? Current and potential uses of technology for the global success of business objectives?

    asked by CORRIE
  161. physics

    Is their anyone that goes to CA homeschooling that can help with roller coaster portfolio?

    asked by kevin
  162. Guest

    they'll tell you they love you and THAN/THEN just leave you.

    asked by Than or Then?
  163. ENG227

    Part One: Analytical Report on a Targeted Sales Letter Your supervisor has asked that you file a brief informal report (approx. 2 single-spaced pages, 500-750 words, plus references) on the background of the company you have chosen to solicit with your

    asked by geniaj
  164. Math

    I'm stuck on my homework, and my parents don't know how to do expanded algorithm

    asked by Nandi
  165. LIFE ORIENTATION

    IN 10-15 LINES CRITICALLY DISCUSS 5 WAYS IN WHICH THE HUMAN OR ENVIRONMENTAL PROBLEM IMPACTS ON THE COMMUNITY.PROVIDE RELEVENT SOURCES TO SUPPORT YOUR CLAIMS.

    asked by SAMUKELISIWE
  166. physics

    What is evaporation,boiling,cryometer

    asked by Emmanuel Timothy
  167. Living Environment

    Tell whether each of the following substances that is filtered from the blood in the glomerulus is absorbed, excreted as part of the urine, or both Water________________________________ amino acids_________________________ glucose____________________

    asked by BIBIN
  168. physics

    Show your work for how the formula was used to calculate a final answer! GPE for second hill: ___ _________________++ Describe how conservation of energy applies to a roller coaster ride from start to finish. This is the last part of roller coaster I'd

    asked by kevin
  169. MS. SUE OR ANYONE PLS. HELP ME..technical writing

    please help me if this is correct i have made for my homework. instruction is below: As a customer service manager for a local software development company, you want to create a user manual for one of the software applications your company develops. The

    asked by jessie
  170. Geometry

    Which of the following can be used to describe the triangle with the vertices listed below? F(-1, 1), G(-8, 1), H(-9, -10) I. acute II. obtuse III. right IV. scalene V. isosceles VI. equilateral -----Please show me how you got the answer

    asked by monique
  171. Philosophy

    Why did Hobbes name his text Leviathan?

    asked by Karen
  172. Physics

    Find the velocity of microwaves having wavelength of 0.75m and frequency 2.75X10^10hz

    asked by +++++Tasha+++
  173. Algebra

    Two perpendicular lines with the equations y=1/3x+9 and y=mx-3 contain consecutive sides of a rectangle. What is the value of m in the second equation?

    asked by monique
  174. English

    In the book "Here lies Arthur", what does the lady of the lake give to Peredeur?

    asked by Anonymous
  175. math

    Which of the following situations cannot be represented by the integer 10? F a balloon rises 10 ft into the air G the stock market gains 10 points H the town lies 10 ft below sea level I Jon received a gift of $10

    asked by Jennifer
  176. Calculus AP need help!

    antiderivative. find f. f'(x)= 3x^(-2), f(1)=f(-1)=0

    asked by MILY
  177. English

    I am making a thesis statement on this topic. Jay Gatsby: Hero or Failure? Is Gatsby a heroic figure that can be idolized or is he a warning to the readers? Would this be a good thesis statement? While some people may view Gatsby as unsuccessful because of

    asked by Rebecca
  178. Social studies

    Why would the Chinese want to limit population growth?

    asked by Jess
  179. Math

    If events A and B are independent and P(A) and P(B) are nonzero, explain why P(A U B) does not equal P(A)+ P(B) im not sure how to answer this

    asked by Diana
  180. physics

    The difference between energy radiated from the sun and energy radiated from the Earth has to do with ____________________. A) Neither of these.B) Both of these.C) radiation frequencies.D) the amounts of radiant energy.

    asked by Kristie
  181. Calculus

    If a(0,-1,3)+b(1,1,1)-c(1,2,5)=(-2,3,-8), determine a,b,c Is this the correct answer: a= -4, b= -3, c= -1?

    asked by Melinda
  182. Geometry

    A right triangle with G and F as the two base angles and E as the top angle. Side EF is Y, side FG is x, while side EG is 2x. If Y = 15, what is the value of x? ----Please help, and explain.

    asked by monique
  183. Math

    scientific notation 0.0000000005 5 x 10(-9)

    asked by Cathy
  184. science

    a 2000 kg sedan is traveling west at 25m/s. How would the sedan's momentum change if it slowed down to 10 m/s?

    asked by joe
  185. Pre-Calculus

    Find a polynomial function with integer coefficients with degree 4, one root 3+radical2, and another root 4-3i. I got x^4-14x^3+80x^2-206x+175 I'm I correct?

    asked by Cooper
  186. Pre Cal

    cos^2+tan^2=1

    asked by Trevion
  187. Pre-Calculus

    Sketch the graph f(x)=-2x^2(x-5)^3(x+2)^4. What would be my coordinates. I solved it and my graph looks nothing like the one on wolframalpha. Can someone show me how you would solve this?

    asked by Cooper
  188. Pre-Calculus

    Sketch the graph f(x)=-2x^2(x-5)^3(x+2)^4. What would be my coordinates. I solved it and my graph looks nothing like the one on wolframalpha. Can someone show me how you would solve this?

    asked by Cooper
  189. science fair

    in my science fair report school layout they want us to write a paragraph on testing my hypothesis and before that they asked us to write the procedure. i wrote the procedure now do i rewrite it for testing my hypothesis? or do i write something else

    asked by Samantha
  190. English

    I think in the last sentence I should vary "to learn of" and leave out "of"

    asked by Matthew
  191. math problem

    please help me solve if I open a book to two facing pages, the product of the page number is 342 what will the two page numbers be

    asked by Lavern
  192. Math

    What are the values of x for 2x-1=0

    asked by Labz
  193. English

    I am writing a paper and I was wondering does this sound like a good thesis? Cofer shows not only the crazyness women but also shows how men can be harsh.

    asked by Annie
  194. math

    last week Ann ran 27 miles less than Jen. Ann ran 19 miles. How many miles did Jen run?

    asked by rob
  195. language arts

    Is the comparative form of sadly....more sadly? and is the superlative form of sadly....most sadly? Thanks.

    asked by Brandi
  196. general chem

    A certain monoprotic weak acid with Ka = 0.49 can be used in various industrial processes. (a) What is the [H+] for a 0.191 M aqueous solution of this acid and (b) what is its pH? Round the [H+] to three significant figures and the pH to two places past

    asked by Bri
  197. maths

    Please I want to know how many litres make a metric tone.

    asked by grace
  198. general chem

    A certain monoprotic weak acid with Ka = 0.49 can be used in various industrial processes. (a) What is the [H+] for a 0.191 M aqueous solution of this acid and (b) what is its pH? Round the [H+] to three significant figures and the pH to two places past

    asked by Bri
  199. math

    last week bre ran 28 miles more than heather. bre ran 35 miles. how many miles did heather run?

    asked by rob
  200. Math

    Find the pcent of decrease to the nearest whole percent? Was:25 Now:17. But i don't understand my teacher, please help me by doing an example.

    asked by Losa
  201. reading

    describ the settings of the text physically and socially and historically. fron the book the red scarf girl

    asked by Amanda
  202. Chem

    Find pH. A) 0.10M Zn(OH)4^-2 F) Zn(OH)2 in 0.010M ZnCl2 Q) 0.010 M Zn(NH3)4^+2 hint: fined [NH3] then kb for OH^- Im having trouble with these can someone help me.

    asked by Alison
  203. physics

    The ocean level rises when global temperature rises, due to ____________________. A) Both of these.B) Neither of these.C) melting of ice caps at the poles.D) thermal expansion of water

    asked by Kristie
  204. math

    find x when f(x)=1 f(x)= x^2+x-12/x^2-4

    asked by danielle
  205. ALGEBRA

    In triangle ABC, the measure of angle B is 27 degrees more than three times the measure of angle A. The measure of angle C is 48 degrees more than the measure of angle A. Find the measure of each angle.

    asked by PLEASE HELP
  206. ALGEBRA

    The perimeter of a triangle is 52 centimeters. The longest is 2 centimeters less than the sum of the other 2 sides. Twice the shortest side is 13 centimeters less than the longest side. Find the lengths of each side of the triangle. What are the lengths of

    asked by PLEASE HELP
  207. Socials

    I have no idea how to answer this. Write a paragraph from Macdonald's point of view defending the decision you have made. Keep in mind your desire to look good politically and personally in your quest to get re-elected. What decision did Macdonald make??

    asked by Lou
  208. calculus

    need help simplifying some trig identities such as: (csc t) (sin t) cos t = 0.75 and tan t = 0.88, find sec t and cot t; (cot2t) (sin2t) + sin2 t; csc2t - cot2t/sin2t

    asked by angelia
  209. Math

    Finding the base or number : 9 is 15% of what number? example please.

    asked by Losa
  210. chemistry

    using the following mechanism, determine the rate law. 2A B+C B+D --> E 2A + D --> C + E k=? please indicate which k you are using for which equation

    asked by katie
  211. Math

    I have solved the following and I am writing just their answers with it, please let me know if these are correct. thanks 1. Simplify, and write in the base of 3: (9^x . 3^4x)^2 answer: 3^12x 2. Differentiate and simplify y= (e^x - 1) / x^2 answer: (xe^x -

    asked by casey
  212. Italy

    What is the officail website for Italy and it's sports?

    asked by Joanne
  213. science fair

    in my science fair report school layout they want us to write a paragraph on testing my hypothesis and before that they asked us to write procedure. i wrote the procedure now do i rewrite it for testing my hypothesis?

    asked by Samantha
  214. math

    Bob finds that the cost of driving his truck is 92 cents per mile. Give a symbolic and graphical representation for a function f(x) that computes the cost in dollars of driving x miles. Assume 0

    asked by Kate
  215. Computer Science

    I got part one but part 2 is confusing. Part1: Create a class called Person that has two subclasses Student and Employee. Make Faculty and Staff subclasses of Employee. A person has name and address. A student has GPA as a real number between 0.00 and

    asked by Jacob
  216. Geometry

    two perpendicular lines with the equations y=1/3x+9 and y=mx-3 contain the consecutive sides of a rectangle. What is the value of mx in the 2nd linear question.

    asked by monique
  217. Civics

    Do you think that it would be easy or hard to convict someone of treason and why?

    asked by Carmen
  218. Statistics

    A study is being planned to estimate the mean number of semester hours taken by students at a college. The population standard deviation is assumed to be o=4.7 hours. How many students should be included in the sample to be 99% confident that the sample

    asked by Jasmine
  219. Business Studies

    WHat are contemporary issues in businesses in Australia

    asked by Anonymous
  220. human behavior at work

    both philosophy and visions are somewhat hazy concepts.How can they be made clear to employees?why are philosophy and vision included as early elements in the organizational behavior system?give an example of an organizational vision that you have read

    asked by wanda
  221. Living Environment

    Tell whether each of the following substances that is filtered from the blood in the glomerulus is reabsorbed, excreted as part of the urine, or both

    asked by BIBIN
  222. human behavior at work

    examine the trends in the models of organizationalbehavior as they develop over a period of time. why have the trends moved in a positive direction?

    asked by wanda
  223. math

    How do I calculate the present value on a deferred annuity for $75,000 for 3 years at an interest rate of 7%.

    asked by cathyj
  224. Derivatives

    differentiate and simplify y= (e^x - 1) / x^2

    asked by help
  225. child psychology

    I still need help with this question Which young adult is at risk of long term identity foreclosure or diffusion? A. A college graduate who switces majors B. An aspiring chef who has no opportunity for culinary training. C.A young woman with several

    asked by sarah
  226. ps 189

    if a aluminum can has a radius of 10cm and a height of 20 cm. how many square cm of aluminum does it take to make such a can.

    asked by sam
  227. healthcare

    What information should you share with others at workplace that promotes to aged care

    asked by Lisa
  228. science

    2 mole jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj

    asked by Anonymous
  229. healthcare

    how can you review and develop your work performance at aged care

    asked by Lisa
  230. Science

    What does a thermohygrometer do?

    asked by anne
  231. Math

    How do you do $1.00 for 6 lemons ?

    asked by Brandon
  232. precal

    (1/tanx-secx))+(1/(tanx+secx))=-2tanx

    asked by olivia
  233. social studies

    How were religion and the Roman government related?

    asked by misty
  234. English

    Writeacher, I'm still working on my paragraph on the presentation of the Irish school. I really hope you'll be there in three hours' time to check if everything is OK. By the way, can you suggest a website, on which (?) phrasal verbs are grouped according

    asked by Matthew
  235. Operations Management

    Explain the key interactions among marketing, design, manufacturing, and finance in product development?

    asked by Nicole
  236. Criminal Justice

    Should judicial review be eliminated? Provide a detailed explanation for your answer.

    asked by Lisa
  237. Physics

    A helicopter winches up an injured person from a boat. The person plus equipment has a mass of 104 kg. If the height of the lift is 84 m and it is carried out at a uniform rate over 70 s, what is the power expended by the helicopter's winch motor? Assume

    asked by Anonymous
  238. chemistry

    Methanol WHat is the chemical formula? What is the molecular formula?

    asked by hedi
  239. network topology

    what type of home network topology do you utilize? does the physical topology differ from its logical topology? if you do not have a homework, research a friends network and use that data in your response.

    asked by sonny
  240. Math 8

    how do you dilate a figure under 1

    asked by Chris
  241. Math 8

    6 1/2 joules. particles looses 0.08 joule of energy every 15 seconds what will energy after 4 minutes. Would this be 6 1/2 - 1.28 divide by 4

    asked by Chris