# Questions Asked onFebruary 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.

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

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

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?

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

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

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?

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

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.

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 *

11. ## algebra

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

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

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

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

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

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

17. ## Chemistry

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

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

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

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.

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?

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.

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

24. ## geometry

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

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?

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

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

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?

29. ## wvuit

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

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)

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

32. ## english

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

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

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

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

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

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?

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

39. ## LANG

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

40. ## LANG

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

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?

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?

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.

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

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) =

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

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?

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

49. ## chemistry

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

50. ## LANG

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

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

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?

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

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

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.

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.

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

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

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

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

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?

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

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?

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.

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?

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

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

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

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

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.

71. ## Chemistry

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

72. ## math

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

73. ## chemistry

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

74. ## Physics

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

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

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?

77. ## ENG

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

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

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

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

81. ## LANG

The direct definition of gloomy is dismal or depressing.

82. ## AP CHEMISTRY

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

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.

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)?

85. ## physics

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

86. ## LANG

Denotative definitions are subject to individual interpretation.

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

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

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

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

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.

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.

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

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

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

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.

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?

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?

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

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

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)

102. ## Calculus

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

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

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?

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)

106. ## lang

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

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

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

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?

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.

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

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?

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

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

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

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?

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

118. ## english

indirect definitions are subject to individual interpretation.

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

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?

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)

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

123. ## Economics

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

124. ## Economics

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

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

126. ## statistics

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

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

128. ## help

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

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

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

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

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.

133. ## LANG

Denotative definitions are also known as direct definitions.

134. ## maths

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

135. ## Maths

AX is the bisector of

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

137. ## geometry

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

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.

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

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

142. ## 6th grade Social studies

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

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.

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?

145. ## Visual Literacy

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

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?

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

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

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.

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

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

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

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.

154. ## American Literature

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

155. ## maths

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

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.

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?

158. ## maths

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

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

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

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

162. ## Algebra 2

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

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,

164. ## Algebra

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

166. ## arithmetic

convert to inches, 30mm wide and 40 mm long

167. ## Calculus

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

168. ## lang

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

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

170. ## Physics

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

171. ## Algebra

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

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?

173. ## algebra

solve square root of y+5-1=2

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

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

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?

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

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

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

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

181. ## maths

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

182. ## algebra

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

183. ## artist

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

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

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.

186. ## physics

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

11/3:11/7

691*81

189. ## Science

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

190. ## Algebra

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

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

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

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

194. ## English

Could you please check these other sentenes. Thank you.

195. ## American Literature

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

196. ## math

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

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

198. ## english

indirect definitions are subject to individual interpretation.

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

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.

201. ## algebra

420-84Y+10Y=462

202. ## Science

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

203. ## mean

how to calculate mean

204. ## math

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

205. ## Algebra 2

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