1. Archives
  2. 2012
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Questions Asked on
February 18, 2012

  1. CHEMISTRY

    Assuming equal concentrations, rank these aqueous solutions by their freezing point: LiSO4, Li3PO4, SnCl4, NH4Br. (from highest freezing point to lowest freezing poinT) Thanks.

    asked by Kylie

  2. geometry

    A slide 4.1 meters long makes an angle of 35 degrees with the ground. To the nearest tenth of a meter bow far above the ground is the top of the slide? sin=35 x/4.1 x=4.1 sin=35 not sure how to do this

    asked by Brandon

  3. computer science

    9.10: Reverse Array Write a function that accepts an int array and the array’s size as arguments. The function should create a copy of the array, except that the element values should be reversed in the copy. The function should return a pointer to the

    asked by Cheryl

  4. physics

    A ball is thrown upward at a speed v0 at an angle of 52.0˚ above the horizontal. It reaches a maximum height of 7.3 m. How high would this ball go if it were thrown straight upward at speed v0?

    asked by Shelby

  5. Algebra

    A ranger spots a forest fire while on a 45-meter observation tower. The angle of depression from the tower to the fire is 12 degrees. To the nearest meter, how far is the fire from the base of the tower? IS THE ANSWER 212 meters

    asked by Anna

  6. Chemistry chemical equilibrium

    1.25 mol of NOCl was placed in a 2.50 L reaction chamber at 427 celciciu degre . After equilibrium was reached, 1.1 mole of NOCl remained. Calculate the equilibrium constant Kc for the reaction

    asked by Abdela

  7. physics

    A net force of 25N is applied for 5.7s to a 12-kg box initially at rest. Waht is the speed of the box at the end of the 5.7s interval?

    asked by Natasha

  8. statistics

    Lorraine was in a hurry when she computed a confidence interval for μ. Because σ was not known, she used a Student's t distribution. However, she accidentally used degrees of freedom n instead of n - 1. Will her confidence interval be longer or shorter

    asked by jr

  9. math

    the international space station orbits 350 km above earth's surface. earth's radius is about 6370 km.use the pythagorean theorem to find the distance from the space station to earth's horizon.

    asked by tee

  10. CHEMISTRY

    A solution of H2SO4(aq) with a molal concentration of 1.94m has a density of 1.119g/mL. What is the molar concentration of this solution? I got an answer of 2.17 M and it is incorrect..please help. My work: So Molar concentration = molal concentration *

    asked by Akle

  11. algebra

    28 decreased by 6 times a number is the same as the number

    asked by Justin

  12. computer science

    The variable cp_arr has been declared as an array of 26 pointers to char. Allocate 26 character values, initialized to the letters 'A' through 'Z' and assign their pointers to the elements of cp_arr (in that order). int

    asked by Cheryl

  13. Physics

    The large blade of a helicopter is rotating in a horizontal circle. The length of the blade is 6.7m, measured from its tip to the center of the circle. Find the ratio of the centripetal acceleration at the end of the blade to that which exists at a point

    asked by Natasha

  14. Physics

    A ball is thrown with a speed of 100m/s attains a height of 150m.Calculate the time of flight the angle of projection

    asked by Nonso

  15. Chemistry

    In reverse osmosis, water flows out of a salt solution until the osmotic pressure of the solution equals the applied pressure. If a pressure of 58.0 bar is applied to seawater, what will be the final concentration of the seawater at 20 C when the reverse

    asked by Tracy

  16. chemistry

    Given this data in a study on how the rate of a reaction was affected by the concentration of the reactants Initial Rate, RUN #(A, M) (B, M) (C, M) (mol L-1 s-1 1 0.200 0.100 0.600 5.00 2 0.200 0.400 0.400 80.0 3 0.600 0.100 0.200 15.0 4 0.200 0.100 0.200

    asked by elvis

  17. Chemistry

    Ba(OH)2(aq)+2CH3COOH(aq)=Ba(CH3COO)2(aq)+2(l)H2O what is the net ionic equation with phases?

    asked by Brad

  18. physics

    A satellite moves on a circular earth orbit that has a radius of 6.68E+6 m. A model airplane is flying on a 16.3 m guideline in a horizontal circle. The guideline is nearly parallel to the ground. Find the speed of the plane such that the plane and the

    asked by Katie

  19. chem

    I just need to know the net ionic equation and balance them. I figured the equation. but the net and balance is harder. Co(NO3)2 (aq) + NaOH (aq) = CoOH (s) + Na(NO3)2 (aq) Co(NO3)2 (aq) + Na2CO3 (aq) = CoCO3 (s) + Na2(NO3)2 (aq) Co(NO3)2 (aq) + Na3PO4

    asked by Suey

  20. Chemistry

    How do you calculate the mass in kilograms of 3.99 liters of acetic acid. The density of this substance is 1.05 g/mL.

    asked by Tina

  21. physics

    An object is dropped from a height of 12m.At what height is the rock kinetic energy and its potential energy be equal?

    asked by dave

  22. Chemistry

    How to prepare 100mL of 3% w/w Hydrogen Peroxide from 30% w/w Hydrogen Peroxide?Specific Gravity of 30%w/w Hydrogen Peroxide is 1.11g/mL. Can you please show the calculation steps? Thanks.

    asked by annie

  23. Short Stories

    1.In "Paul's Case," why does Paul go to work early? A. He didn't want to get caught skipping school. B. He liked looking at the pictures in the art gallery. C. He wanted to wrestle with the other boys. D. He didn't want to lose his job. (B) ? 2. Which one

    asked by Nick

  24. geometry

    The length of the hypotenuse of a 30-60-90 triangle is 12. Find the perimeter.

    asked by Brandon

  25. Chemistry

    Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 10.7 g of biphenyl in 33.9 g of benzene?

    asked by Sarah

  26. chem

    I really need these answers to balance the net ionic equation or make it into one. Cu(NO3)2 (aq) + NaOH (aq) = CuOH (s) + Na(NO3)2 (aq) Cu(NO3)2 (aq) + NaI (aq) = CuI (s) + Na(NO3)2 (aq) Cu(NO3)2 (aq) + Na3PO4 (aq) = CuPO4 (s) + Na3(NO3)2 (aq) Fe(NO3)3

    asked by Suey

  27. Chemistry

    A solution is made by mixing 30.0 mL of ethanol, C2H6O, and 70.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C? I got an answer of 15.45 torr and it marked me incorrect and said "Your answer is the the partial

    asked by Lauren

  28. geometry

    Can someone help? Your make a scale drawing of a tree using the scale 5 in. =27 ft. If the tree is 67.5 ft tall, how tall is the scale drawing?

    asked by myles

  29. wvuit

    calculate the enthalpy change for the reaction n2h4(l) + 02(g) --> n2(g) + 2h20(l)

    asked by elizabeth

  30. AP CHEMISTRY

    Write the formula for each of the following compounds, being sure to use brackets to indicate the coordination sphere. A) bis(bipyridyl)cadmium(II) chloride B)potassium tetrabromo(ortho-phenanthroline)- cobaltate(III)

    asked by MARY

  31. chem

    I just need to know the net ionic equation and balance them. I figured the equation. but the net and balance is harder. Co(NO3)2 (aq) + NaOH (aq) = CoOH (s) + Na(NO3)2 (aq) Co(NO3)2 (aq) + Na2CO3 (aq) = CoCO3 (s) + Na2(NO3)2 (aq) Co(NO3)2 (aq) + Na3PO4

    asked by Ari

  32. english

    chick: a young woman A. direct definition B. indirect definition a

    asked by eric

  33. Ap chemistry

    15 ml of .325 M NaOH is delivered into a 35 ml HObr solution of unknown concentration.The pH of the final solution is measured to be 7.48.Ka for HOBr is 2.0 * 10^-9 at 25C. Find the number of moles of OBr- and HOBr in the final solution

    asked by Jdawg

  34. chemistry

    The half-life of a reaction was found to be inversely dependent on the concentration of the starting material. Thus, we can say that a. the reaction is zero order b. the reaction is first order c. the reaction is second order d. the reaction starts out

    asked by elvis

  35. English

    i take better quotes from story a few notes for orpheus i need help choosing best 5 ones. all these show theme really well so i not know which 5 to choose. "I was almost glad to hear her. But something must be wrong. She never phoned me." "Will you come up

    asked by Mohammad

  36. College Algebra

    A projectile is thrown upward with an initial velocity of 272 feet per second. After t seconds, its height h(t)above the ground is given by the function : h(t)=-16t^2+272t. a. Determine the projectile's maximum height. b. Determine how long it takes the

    asked by Amelia

  37. Economics

    Suppose George is making $18 an hour installing electronic chips in hand held computers. Would you offer to work for $8 an hour to get you the job? Why might a profit-maximizing employer turn down you offer?

    asked by Karen

  38. chemistry

    The Clapeyron-Clausisus Equation is ln(P2/P1) = dHvap/R [(1/T1)-(1/T2)]. Assuming that dHvap doesn't change with the temperature, this equation relates the change in vapor pressure and temperature to a substances enthalpy of vaporization (R is the molar

    asked by isabelle

  39. LANG

    noxious: harmful or injurious to health or physical well-being A. connotative B. denotative it think A

    asked by kesha

  40. LANG

    Determine whether the definition below is connotative or denotative. gray: a cold, gloomy day A. connotative B. denotative I GOT A

    asked by kesha

  41. statistics

    If only the upper 30% of a normally distributed class passed a quiz for which the mean was 70 and the standard deviation was 10, what was the lowest score a student could have received and still have passed?

    asked by Cody Morris

  42. physics

    In a head on collision,a car stops in 0.18s from a speed of 29 m/s . The driver has a mass of 74 kg, and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second?

    asked by Anonymous

  43. chemistry

    The units of a rate constant for zero, first and second order reactions are given in the textbook. If the time units are minutes, what would you expect the units to be for a third order reaction? a. 1/min3 b. mol2/L2-min c. L/mol-min2 d. L2/mol2-min e.

    asked by elvis

  44. Chemistry

    In reverse osmosis, water flows out of a salt solution until the osmotic pressure of the solution equals the applied pressure. If a pressure of 59.0 bar is applied to seawater, what will be the final concentration of the seawater at 20 °C when reverse

    asked by Melody

  45. chem

    I just need to know the net ionic equation and balance them. I figured the equation. but the net and balance is harder. Fe(NO3)3 (aq) + Na2CO3 (aq) = FeCO3 (s) + Na2(NO3)3 (aq) Fe(NO3)3 (aq) + NaI (aq) =FeI (s) + Na(NO3)3 (aq) Ba(NO3)3 (aq) + Na3PO4(aq) =

    asked by Suey

  46. physics

    After leaving the end of a ski ramp, a ski jumper lands downhill at a point that is displaced 44.5 m horizontally from the end of the ramp. His velocity, just before landing, is 15.4 m/s and points in a direction 35.1 ° below the horizontal. Neglecting

    asked by Shelby

  47. physics

    A 3.47 kg ball is attached to a ceiling by a 1.63 m long string. The height of the room is 5.59 m. What is the gravitational potential energy of the ball relative to the ceiling?

    asked by Gabe

  48. chemistry

    For the reaction, A = B + C, the rate law is kA]. If it takes 80.0 seconds for 70.0% of a 10.0 gram sample of A to be transformed into products, what is the value of the rate constant? a. 0.00450 s-1 b. 0.0290 s 1 c. 0.00530 s-1 d. 0.0150 s-1 e. 5.40 s-1

    asked by elvis

  49. chemistry

    KI+H2SO4+KIO3 Write the balanced net ionic equation.

    asked by Greg

  50. LANG

    duplicity: the state or quality of having two elements or parts; being twofold or double. A. connotative B. denotative I GOT B

    asked by kesha

  51. physics

    A golfer, standing on a fairway, hits a shot to a green that is elevated 5.39 m above where she is standing. If the ball leaves her club with a velocity of 43.1 m/s at an angle of 45.9 ° above the ground, find the time that the ball is in the air before

    asked by Shelby

  52. physics

    A 32.2-kg child swings on a rope with a length of 6.06 m that is hanging from a tree. At the bottom of the swing, the child is moving at a speed of 4.2 m/s. What is the tension in the rope?

    asked by Jessica

  53. LANG

    Determine whether the definition below is connotative or denotative. relevant: bearing upon or connected with the matter in hand; pertinent: A. connotative B. denotative B

    asked by kesha

  54. Physics help please!!!

    The angular speed of digital video discs (DVDs) varies with whether the inner or outer part of the disc is being read. (CDs function in the same way.) Over a 133 min playing time, the angular speed varies from 570 rpm to 1600 rpm. Assuming it to be

    asked by john

  55. Calculus

    Suppose that the revenue in dollars from the sale of x campers is given by the formula shown below. R(x) = 58,000x + 38,000(10 + x)−1 − 4000 (a) Find the marginal revenue when 10 units are sold.

    asked by Carol

  56. statistics

    True or false? Every random sample of the same size from a given population will produce exactly the same confidence interval for μ.

    asked by jr

  57. spanish

    Completa las oraciones con la forma correcta de cada verbo. 1. En bicicleta podemos explorar el parque sin _____(caminar) demasiado. 2. Mis hijos van a dejar todo limpio antes de ____(salir) del parque. **I have tried every possible form of verb

    asked by sam

  58. LANG

    Determine whether the definition below is a direct definition or an indirect definition. chick: a young woman A. direct definition B. indirect definition I GOT B

    asked by kesha

  59. chemistry

    The half-life of a reaction was found to be inversely dependent on the concentration of the starting material. Thus, we can say that a. the reaction is zero order b. the reaction is first order c. the reaction is second order d. the reaction starts out

    asked by elvis

  60. Implicit Differentiation

    Find the slope of the tangent line to the curve (a lemniscate) 2(x^2+y^2)^2=25(x^2–y^2) at the point (–3,1) . I know that we are supposed to use chain rule for this problem but i think i am messing up on the algebra. Can someone please help me, i keep

    asked by jasmineT

  61. Physics

    Two satellites are in circular orbits around Jupiter. One, with orbital radius r, makes one revolution every 18 h. The other satellite has orbital radius 3.9r. How long does the second satellite take to make one revolution around Jupiter?

    asked by Alex

  62. physics

    On a frozen pond, a 13.2 kg sled is given a kick that imparts to it an initial speed of v0 = 2.48 m/s. The coefficient of kinetic friction between sled and ice is μk = 0.123. Use the work kinetic energy theorem to find the distance the sled moves before

    asked by Joe

  63. Math ratios

    The ratio of cars to vans in a parking lot was 5 to 2. There were 28 cars and vans in the parking lot. How many cars were in the parking lot? How many vans were in the parking lot?

    asked by Joe

  64. Physics

    A hot air balloon is hovering at an altitude of 6000 meters. The pilot decides that it is time to descend and turns off the balloon's burners. Once the balloon reaches the ground, the gas inside the balloon occupies 980 m^3 and is at atmospheric pressure.

    asked by GRISSELL

  65. Physics??

    A car is traveling at a speed of 62 on a freeway. If its tires have diameter 24.0 and are rolling without sliding or slipping, what is their angular velocity?

    asked by bety

  66. Chemistry

    I had to perform an experiment for the freezing point depression in which we had to determine the frezzing points of water as a pure solvent, sodium chloride, sucrose, and ethylene glycol. We had to work with a partner so I completed the experiment for

    asked by Hannah

  67. economics

    Bubba's Burgers sells hamburgers in a perfectly competitive market at a price of $1.50 each. At the profit-maximizing (cost-minimizing) level of output, average total cost is $1.90 per hamburger and average variable cost is $1.75 per hamburger. Should the

    asked by Ophilia

  68. Chem

    A solution is made by dissolving 0.584 mol of nonelectrolyte solute in 883 g of benzene. Calculate the freezing point and boiling point of the solution. Tf=? Tb=? I got Tf as 3.39 degrees Celsius I got Tb as 1.67 degrees Celsius It marked me wrong and said

    asked by Jen

  69. Chemistry

    0.0337g of a volatile liquid when vaporized completely at 100Pa and 300K occupied a volume of 20cm3. When this volume of vapor was completely burnt in an excess of oxygen, 40cm3 of carbon dioxide and 20cm3 of water vapor were formed. All volumes being

    asked by Shaun

  70. Physics

    A 3.10μC and a -1.91 μC charge are placed 3.56 cm apart.At what points along the line joining them is the potential zero? I calculated one point to be 2.20cm but I don't know how to get the other point.

    asked by Madiason

  71. Chemistry

    What would the product be: 1.NaBr + CI2 2.NaBr + Br2 Would the products be: 1. Iodine? 2. Bromine? Thank You!

    asked by Fisher

  72. math

    How many positive even three-digit integers are divisible by 3?

    asked by Miep

  73. chemistry

    How much heat in joules is required to heat a 40g sample of aluminum from 77*C to 150*F?

    asked by lorray

  74. Physics

    A potato gun shoots a potato horizontally from a height of 5 feet. How long does it take to hit the ground?

    asked by Steve o

  75. Calculus (Antiderivatives)

    Suppose f(x) is a continuous function. Then a function F(x) such that F'(x) = f(x) is called: A.) the indefinite integral of f B.) the antiderivative of f C.) an antiderivative of f D.) a definite integral of f E.) All of the above

    asked by Mishaka

  76. math

    In a sports league of n teams in which each team plays every other team twice, the total number N of games to be played is given by N = n2 - n. What is the total number of games to be played in a football league having 17 teams?

    asked by Andrew

  77. ENG

    connotation definitions are made up of the set of associations implied by a word in addition to its literal meaning.

    asked by kesha

  78. Phy

    The index of refraction for a diamond for red light of wavelength 655 nm is 2.35, while that for blue light of wavelength 437 nm is 2.26. Suppose white light is incident on the diamond at 29.5. Find the angle of refraction for red light. Answer in units

    asked by Joila

  79. geometry

    A large totem pole in the state of Washington is 100ft tall. At a particular time of day, the totem pole casts a 249ft-long shadow. Find the measure of

    asked by Brandon

  80. Physics

    A hydraulic jack is used to move an 8896 Newton car. If the area of the output piston is 8 times that of the input piston, how much input force is required to lift the the car? Is this where I do P=PA or F1(A2)/F2 = A1(f2)/F2 F1 = A1F2/A2 Please help set

    asked by GRISSELL

  81. LANG

    The direct definition of gloomy is dismal or depressing.

    asked by kesha

  82. AP CHEMISTRY

    What is the expected electron configuration for each of the following ions. A)Cu+ B)Ti2+

    asked by JIM

  83. physics

    A golfer hits a shot to a green that is elevated 3.0 m above the point where the ball is struck. The ball leaves the club at a speed of 19.4 m/s at an angle of 45.0˚ above the horizontal. It rises to its maximum height and then falls down to the green.

    asked by Shelby

  84. Physics

    A book slides off a table top with a speed of 11 meters per second . It strikes the floor in 0.66 seconds . How tall was the table ( in meters)?

    asked by Steve o

  85. physics

    If a wheel 211 cm in diameter takes 2.25 s for each revolution, find its period. T=?s

    asked by sammy

  86. LANG

    Denotative definitions are subject to individual interpretation.

    asked by kesha

  87. English

    Could you please check these other sentences? Thank you. 2)Then he describes his family and friends as ...... both in shape and disposition (rephrase) though more civilized and endowed with the gift of speech. These qualities, however, do not make them any

    asked by Henry2

  88. English

    I am writing an essay about what the online community offers that the actual community doesn't. I need help finding some interviews or some solid evidence on how you save money by using the online community and lose money in the actual community. Any ideas

    asked by Anonymous

  89. AlgebraII

    PLEASE HELP! I DO NOT KNOW WHAT TO DO? The maximum weight that a rectangular beam can support varies jointly as it's width and the square of its height and inversely as its length. If a beam 1/2 foot wide, 1/3 foot high, and 10 feet long can support 12

    asked by Tina

  90. physics

    In an amusement park ride, cars are suspended from L = 4.22 m cables attached to rotating arms at a distance of D = 6.25 m from the axis of rotation. The cables swing out at an angle of θ = 49° when the ride is operating. What is the angular speed of

    asked by Jon Tuck

  91. Physics

    A hot air balloon is hovering at an altitude of 6000 meters. The pilot decides that it is time to descend and turns off the balloon's burners. Once the balloon reaches the ground, the gas inside the balloon occupies 980 m^3 and is at atmospheric pressure.

    asked by GRISSELL

  92. algebra

    An artifact was found and tested for its carbon-14 content. If 84% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years.

    asked by Anonymous

  93. Chemistry

    I conducted a Gas Chromatography experiment using Flame Ionisation Detector (FID).A capillary column was used. 1)Blank 2) Standard 3) Sample 4)Blank 5)Standard The above was injected into the system. In 2)Standard chromatogram,a sharp, thin peak was

    asked by mandy

  94. math

    A company produces three types of color TVs: Models X, Y and Z. Each model X requires 2 hours of electronic work and 2 hours of assembly work. Each Y model requires 1 hour of electronic work and 3 hours of assembly work. Each model Z requires 3 hours of

    asked by Jen

  95. Algebra

    STILL DON'T GET THIS can anyone explain me this please a cylinder has a volume of 19cm^3. If the radius is doubled, what is the volume of the new cylinder? HOW TO DO THIS

    asked by John

  96. Calculus

    A blast blows a rock straight up at 150 ft/sec. The path of the rock is described by the s(t) = 150t-16t^2 where s is measured in feet and t in seconds. Find the velocity of the rock when it is 200 ft above the ground and when the rock hits the ground.

    asked by Desperate!!!!

  97. Math help

    If a physician prescribed 4gm of aspirin to be taken daily, how many 5 grain tablets should the pt take each day?

    asked by Vicki

  98. Math

    How many horizontal tangents does the graph of f(x)=(x-1)^2(x-3)^2 have? f(x)=(x-1)^2(x-3)^2 =2(x-1)(1)+2(x-3)(1) =2x-2+2x-6 f'(x)=4x-8 0=4x-8 =4(x-2) x=2 Therefore it only has 1 horizontal tangents?

    asked by Jessi

  99. math

    The Twin Prime Conjecture, which has not been proven, argues that there are infinitely many pairs of primes of the form n and n+2. Such a pair is called a prime pair. Some examples of prime pairs are 5 and 7, 17 and 19, and 29 and 31. How many prime pairs

    asked by Miep

  100. statistics

    Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190 friends

    asked by Miller

  101. English

    Could you please checke my summaries? Thank you. 1)At the beginning of the passage, taken from Chapter 11 of Swift’s Gulliver’s travels, the Houyhnhnms are described as strong, beautiful, wise and fast horses full of virtues and intelligence. 2)

    asked by Henry2

  102. Calculus

    Find the derivative of the function. Simplify and express the answer using only positive exponents only. y = (x - 4)^2 (x + 3)

    asked by Carol

  103. Math, mathematics of finance

    I am stuck on these two math questions. If nyone could help me solve them it would be greatly appreciated! Here is the information: Engineering estimates indicate that the variable cost of manufacturing a new product will be $35 per unit.Based on market

    asked by Zoey

  104. math

    In a town, 2/3 of the adult men are married to 3/5 of the adult women. The number of married men and women are equal, and the adult population is over 100. What is the smallest possible number of adult residents in the town?

    asked by Miep

  105. chemistry

    In the following reaction, how many grams of chlorine can be produced if 120 grams of titanium chloride (TiCl4) reacts with oxygen: TiCl4(g) + O2(g) TiO2(s) + Cl2(g)

    asked by salem girl

  106. lang

    A science that looks at atmosphere and the weather. A. Chemistry B. Meteorology C. Geology D. Astronomy d

    asked by kesha

  107. chemistry

    Ben has 1L of 0.1mol/dm3 solution of KI & wish to take a sample containing 8.3g of solute.What volume should he measure

    asked by Luc

  108. chemistry

    The initial concentration of the a substance was 1.95 M. After 27.72 hours the concentration was 0.9750 M. After anothers 55.44 hours the concentration was 0.4875 M (total time = 83.16 hours). If another experiment were conducted in which the initial

    asked by Derren

  109. math

    Every 5th customer gets $2 off coupon. Every 7th customer gets $5 coupon and every 15th customer get $20 coupon. Some get 2 prizes and a few get all 3 prizes. If 400 customers come in how many people will get prizes? How much money is given out?

    asked by Ire

  110. physics--please help

    Only need help with part c--answer for part a is 2.94 radians and for b it is 777 days Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days.

    asked by sara

  111. statistics

    The Business School Dean wants to determine if the future plans are significantly different for the three majors at a level of confidence of at least 90%. What test(s) would you recommend? 2. A company hired 20 salespeople and gave them an initial sales

    asked by Tonya

  112. Calculus

    How many tangents does the graph of f(x)=(x-1)^2(x-3)^2 have? I found out the derivative of f(x)=(x-1)^2(x-3)^2 f'(x)=4x^3 - 24x^2 + 44x -24 What do I do next?

    asked by Matthew

  113. chemistry

    prepare 25.00mL of a standard solution of vitamin C at a concentration of 2.00 mg/mL. What weight of vitamin C is required

    asked by ama neat

  114. Physics

    A man and a woman are walking across soft ground. The woman wears stilettos; each heel has a cross-sectional area of 0.95cm^2 (0.000095m^2) The man wears a flat shoe with a heel area of 110cm^2 (or 0.011m^2) 1. If the woman weighs 520 Newtons, how much

    asked by GRISSELL

  115. English

    I couldn' post my last sentences. I'll try again. Thank you very much. 4) This habit is so rooted in himself that his friends tell him that he trots like a horse. He considers it as a compliment. He admits that he sometimes happens to modulate his voice in

    asked by Henry2

  116. abstract algebra

    Suppose K = {{2,3,4,5,6,7},{2,5,7,8,12},{1,2,3,5,7,9,13,20}}. Find three upper bounds for K in P(N) and three lower bounds. Does K have a least upper bound? Does K has a greatest lower bound?

    asked by lala

  117. MATH HELP PLEASE

    3p-1 = 5(p-1) - 2(7-2p)

    asked by kewl

  118. english

    indirect definitions are subject to individual interpretation.

    asked by eric

  119. AP CHEMISTRY

    Calculate [OH-] and pH for the following strong base solution; a solution formed by mixing 10.0 mL of 0.011 M Ba(OH)2 with 28.0 mL of 7.4 10-3 M NaOH working and answer would be appreciated

    asked by MARY

  120. history

    Cities and urban areas were a source of economic opportunities in the post-Medieval Western world. How was the full potential of Western cities and urban areas in this regard was realized during the Industrial Revolution?

    asked by annie

  121. Calculus-derivatives

    Verify these answers~ 1. For what value(s) of x does f(x)=(x^2-16)^5 have a horizontal tangent? a) x=-4,4 b) x=-4,0,4 c) x=0 d) x=0,4 Answer is B, x=-4,0,4 --------------------------------------- 2. What is the derivative of f(x)=(3x^2+7)^3? a)

    asked by Jake

  122. Chemistry

    Look up the solubility of NaCl in both water and ethanol (in the CRC handbook of chemistry which i don't have access to, and any help would be appreciated) Consider the dissolution process, and competing intermolecular forces to account for the observed

    asked by James

  123. Economics

    what is an economic problem with welfare in canada and how can it be solved? I basically need a thesis.

    asked by Labiba

  124. Economics

    what is a good economic problem with welfare? I searched a lot, but i can't find anything.

    asked by Anonymous

  125. chemistry

    A reaction has a rate law, rate = kA]B]^2 What is the overall order of the reaction? a. 2 b. 3 c. 0 d. 1 e. 4 chemistry - DrBob222, Friday, February 17, 2012 at 10:53pm The overall is the sum of the orders of each component. still don't get it but guessing

    asked by elvis

  126. statistics

    Can someone help me to understand the purpose of null hypothesis testing?

    asked by Patiance

  127. algebra

    use any three of the digits 2,3,4 and 6 to form an 8 digit factor and a two didgit factor with a estimated product that is between 140 and 250

    asked by brittany

  128. help

    Human Race A. Philosophy B. Sociology C. Humanities D. Economics d

    asked by kesha

  129. Implicit Differentiation

    Use implicit differentiation to find the slope of the tangent line to the curve y/x+6y=x^2–6 at the point (1,–5/31) . Again i think i'm messing up with the algebra here. I used quotient rule to get [(x+6y)(y')-(y)(1+6y')]/(x+6y)^2=2x I don't know how

    asked by jasmineT

  130. Microecomics

    Assume two firms have the same total costs of production. Firm A’s average variable cost if $5 per unit and firm B’s average variable cost is $7. Both firms have an average total cost of $8. If the current market price is $6 and remains unchanged what

    asked by Ophilia

  131. math

    In 1920, the record for a certain race was 45.5 sec. In 1970, It was 44.5 sec. Let R(t)=the record in the race and t=the number of years since 1920 Predict the record for 2003 and 2006

    asked by jess

  132. Linear Algebra

    Find an example of 2 by2 matrices with a12 = .5 for which: a. A^2 = I b. A^-1 = A^T c. A^2 = A By the way, a12 means the first row and second column.

    asked by fatih

  133. LANG

    Denotative definitions are also known as direct definitions.

    asked by kesha

  134. maths

    If f(x)=x-1/2x^2-x-3.Find (i)f(2) (ii)x if f(x)= 0

    asked by chrystabelle

  135. Maths

    AX is the bisector of

    asked by leon hydra

  136. statistics

    A store owner decides to put a coupon in the Sunday newspaper. The advertising firm she works believes that at least 20% but no more than 30% of people who shop at his store will use the coupon. The paper circulates 50,000 copies of the Sunday paper and

    asked by ty

  137. geometry

    what equation represents the relationship of perimeter of a square varies directly as the length of it's side ?

    asked by tom

  138. math

    A long-distance runner runs 2 miles south and then 4 miles east. How far is the runner from the starting point? Round to nearest tenth.

    asked by Leo

  139. Calculus

    i was just wondering if there was a difference between infinty and indetrminant. my freind said there the same thing. But i thought that for example if you are given a limit for a function, by direct subsitution you find that answer is infity. the

    asked by Pria

  140. Effects of specil needs children on development

    please help answer question with latest research findings.

    asked by Gaspar

  141. English

    First slide: I not know what to put on first slide, I was putting theme of story (If you look back you will be destroyed) but I not want to give this away in starting, I give it in end. For first slide I want to say something like “He couldn’t follow

    asked by Mohammad

  142. 6th grade Social studies

    What was the main effect of the repeated exiles of the Jews ?

    asked by Elaina

  143. Physics I am lost please help

    A planet has two satellite moons. Moon X has an orbital period of 2.13 days. Moon Y has an orbital period of about 3.53 days. Both moons have nearly circular orbits. Use Kepler's third law to find the distance of each satellite from the planet's center.

    asked by Angelina

  144. statistics

    I need to see the steps to figuring out this problem. 270 patients were given a placebo of those 270, 19 had headaches. What percentage of this placebo group reported headaches?

    asked by Tara

  145. Visual Literacy

    What are the factors that determine whether or not a print design can be classified as "good design?"

    asked by John

  146. Calculus

    Determine the coordinates of the point(s) on the graph of y=3x- 1/x at which the slope of the tangent is 7. So the derivative of y=3x- 1/x is y'=3 + 1/x^2 What do I do next?

    asked by Jessi

  147. science

    what is a :sweat shop" and before u type ill tell u that it isnt a shop in which u by sweat frum

    asked by smileyface

  148. Science

    The rest stops the driver made are included in the calculations because that is hoe the problem is defined. However, suppose the bus driver's manager wants to know the average speed at which the driver was actually driving the bus that day while he was on

    asked by Angelica

  149. chemistry

    An element x has 3 isotopes,a,b,c.a has 5% abundance b,20%,c,75% &a has a mas of 40,b 42,c 45.what is the essntial differnce in the nuclear structure.

    asked by Luc

  150. Physics

    A 9000 Kiogram boat floats in a lake. If half of the boat is submerged, which of the following is true: 1. The boat is less dense than the water in the lake. 2. The buoyant force is less than half the weight of the boat. 3. The buoyant force is greater

    asked by GRISSELL

  151. LANG

    Determine whether the definition below is connotative or denotative. home: a place of warmth, comfort, and affection A. connotative B. denotative I GOT A

    asked by kesha

  152. maths

    If f(x) = x-1/2x^2 - x -3.Find (i)f(2) (ii) x if f(x)= 0 (iii)values of x that are not in the domain of the function

    asked by chrystabelle

  153. chemistry

    The reaction A -> B + C is 1st order w/ respet to A. It's rate const k is equal to 0.343 M/s at 273K. The initial concentration of A was 0.399 M. Calculate the concentration of B after 0.185 secs have passed.

    asked by bernard

  154. American Literature

    Based on "To Whistler, American," how does Pound view the role of American art and literature?

    asked by help

  155. maths

    1.IF Vector OA =2i + 3j – k, vectorOB = i – 2j + 3k determine the value of vectorS ,OA X OB

    asked by chrystabelle

  156. maths

    Given that vector c and vector d are non zero vectors such that vector c =x1i + y1j + z1k and vector d =(y1z2-y2z1)+(x1y2 -x2y1)show that the two vectors are perpendicular.

    asked by victor m

  157. math

    The business school Dean wants to determine if the future plans are significantly different for the three majors at a level of confidence of at least 90%. what test would be recommended?

    asked by Tonya

  158. maths

    given that (2 +3i)(3-4i)=x+yi,find x and y

    asked by ceasar

  159. Accounting

    I am having difficulties with the accounting problem below Roland Andersson is the manager of the Ekland Division of Ystad Industries. He is one of several managers being considered for position of CEO, as the current CEO is retiring in a year. All

    asked by Del

  160. Calculus

    i was just wondering if the limit of a funtion exists as it approches a value if both the right side limit and the left side limit both equal the same infinity ( postive inififnty for both sides, or negative infinty for both sides). i know that if one side

    asked by Pria

  161. science

    31kg.swimmer.runs.with.a.horizontal..velocity.of.4,0.m/s.off.a.boat.dock.and.lands.in.a.stationery.rubber.raft.of.mass.og.9kg..what.would.be.the.velocity.of.the.swimmer.and.raft.after.the.impact.assuming.no.water.resistance

    asked by sukie

  162. Algebra 2

    2^(3x+1)=2^)2/x) I don't know what to do here to get both of the xs

    asked by Jack

  163. history

    I need an opinion regarding this thesis statement. Urban areas had always served as the logical epicentre for organized opposition against the establishment. However, due to the presence of urban classes trying to fight for their own material interests,

    asked by jesse

  164. Algebra

    What are 3 ways to solve system of linear equations in two variables?

    asked by Anonymous

  165. Math

    2m+6=2m-1 Please help me solve this and show your work thanks.

    asked by Haylie

  166. arithmetic

    convert to inches, 30mm wide and 40 mm long

    asked by Rebekah

  167. Calculus

    y = √3x + 2 cos(x), 0 ≤ x < 2π Find a derivative y'.

    asked by Stephen

  168. lang

    Disagreement A. Conflict B. Resolution C. Social Norms D. Circumstances c

    asked by kesha

  169. Algebra

    a cylinder has a volume of 19cm^3. If the radius is doubled, what is the volume of the new cylinder? HOW TO DO THIS

    asked by JOhn

  170. Physics

    When altitude increases, pressure decreases and density decreases. Is this true in a statement descrbing the relationship between the three?

    asked by GRISSELL

  171. Algebra

    12^-3 x 12^10 x 12^0

    asked by chaya

  172. calculus

    if the derivative of f is f'(x)=ln(x^2+1)-2, at which of the following values of x does f have an abslolute value?

    asked by illy

  173. algebra

    solve square root of y+5-1=2

    asked by Mary

  174. argosy

    How will you apply what you learned in this Orientation Workshop to your educational, personal, or professional pursuits? Provide relevant personal notes and observations, such as anything discussed in this Orientation Workshop, that you want to learn more

    asked by shay jones

  175. physics

    Who is credited with inventing the fluorescent light bulb? Some resources told me it was Nikola Tesla, yet others told me it was a collaboration of Peter Cooper Hewitt, Edmund Germer, George Inman, and Richard Thayer. Can someone please clarify this for

    asked by jtsexyback

  176. abstract algebra

    Suppose K = {{2,3,4,5,6,7},{2,5,7,8,12},{1,2,3,5,7,9,13,20}}. Find three upper bounds for K in P(N) and three lower bounds. Does K have a least upper bound? Does K has a greatest lower bound?

    asked by lala

  177. Political Science

    Is the rational-comprehensive model or the incremental model best used to describe policymaking in the United States? Provide examples to support your model choice

    asked by unknown

  178. chemistry

    Can u help me plz.A compound producd 1200cm3 of N2 @ rtp.a) how many N2 molecules were in the sample & wat mas of N2 is producd

    asked by Luc

  179. science

    learning about protists i have a blank to fill in: Producers use _____ as energy , during what process?? i wrote sunlight , photosyntheses process is this right? Quest2 Protists producers are algae that have green pigment, chlorphyll that is used for

    asked by marko

  180. business statistics

    store manager is doing a study on how to staff his franchise. He knows that the average number of pizzas ordered is 12 per hour with a standard deviation of 1.4 pizzas. Staffed with 3 employees, he can assemble up to 15 pizzas per hour. If his store is

    asked by ty

  181. maths

    Evaluate cuberoot of z given that z =8(cos264degrees + isin264degrees)

    asked by ceasar

  182. algebra

    2(10-2y)+y((3/7)/(9/10))=22

    asked by monty

  183. artist

    What inspired Pablo Picasso to paint Weeping woman? Please give some historical context. Thanks

    asked by john

  184. Math

    x P(x) -2 0.31 3 0.33 7 0.06 11 ? by using probability distribution , what is value of 11.plz help me

    asked by shan

  185. chemistry

    calculate the water vapor pressure of benzene at 0.80, 0.60, 0,40, and 0.20 mole fraction and toluene at 0.20, 0.40, 0.60, and 0.80 mole fraction.

    asked by isabelle

  186. physics

    What are the mass and the atomic number for the anion of Cl 35?

    asked by Danny

  187. math

    11/3:11/7

    asked by Anonymous

  188. math

    691*81

    asked by Anonymous

  189. Science

    The cirucumference of a ballon is 75 inches and the diameter is 12 inches what is the volume?

    asked by Joseph

  190. Algebra

    (x^9)^0(x^7)2

    asked by Anna

  191. micreconomics

    Assume that you own a lake house. Unfortunately your job will require that you spend the summer on the road and you won’t be able to enjoy it. You decide that you will rent it out for the summer while you are working. The mortgage payment on the lake

    asked by Ophilia

  192. speech

    So Im going to be doing an informative speech on dog-human communication. The visual aid I can use is a powerpoint. I really need help kind of outlining/ deciding what to talk about. I got a couple of books and have some research on it and there seems to

    asked by Rebekah

  193. comparing group means

    what appropriate null and alternative hypothesis would i use in this problem a teacher gives students a holding review session. did attending the session make a differnts in the final points in the class,give example of the appropriate statisical procedure

    asked by janet

  194. English

    Could you please check these other sentenes. Thank you.

    asked by Henry2

  195. American Literature

    Of Fitzgerald, Hemingway, Pound, and Stein, who was the least published writer? I have no clue about it

    asked by help

  196. math

    five thousand randomly selected MBA graduates were surveyed to determine their future plans. the survey rate was 10% .

    asked by Tonya

  197. math

    an automobile manufacture markets the same vehicle in Europe and the U.S.,base on a sample of 100 vehicles in each market, mena quality rating of 4.3 was reported in the U.S. compared to the mean rating of 3.7 in Europe. what test should be used to

    asked by Tonya

  198. english

    indirect definitions are subject to individual interpretation.

    asked by eric

  199. business statistics

    A store owner decides to put a coupon in the Sunday newspaper. The advertising firm she works believes that at least 20% but no more than 30% of people who shop at his store will use the coupon. The paper circulates 50,000 copies of the Sunday paper and

    asked by ty

  200. Physics

    If you throw a 36 kilogram rock off a cliff , how fast does it accelerate to the ground? The earth excerts a force of 200 Newtons on the rock.

    asked by Steve o

  201. algebra

    420-84Y+10Y=462

    asked by monty

  202. Science

    In what ways is science self correcting? i was just intrested :)

    asked by Henry

  203. mean

    how to calculate mean

    asked by Anonymous

  204. math

    The forth and seveth terms of an A. P are 3 and 36. Find the A.P and its fifteenth term

    asked by Anonymous

  205. Algebra 2

    2^(3x+1)=2^)2/x) I don't know what to do here to get both of the xs

    asked by Sabr

  206. earth

    do any questions here actually get answered??????

    asked by asdfghjkl

  207. English

    Sorry, for including so many sentences in a single post. I realized it only later. I included the ones I was doubtful of. 1) Customs duties in imports and exports of raw materials were removed. He was accused of corruption but he survived a change of

    asked by Henry2
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