# Questions Asked onJuly 21, 2011

1. ## physics

A skier is accelerating down a 30.0 degrees hill at 1.80m/s^2. How long will it take her to reach the bottom of the hill, assuming she starts from rest and accelerates uniformly, if the elevation change is 375 m? Apparently the answer isn't 20.4 s... Can

2. ## Chem 2

The half-life for the radioactive decay of U-238 is 4.5 billion years and is independent of initial concentration. a) How long will it take for 10% of the U-238 atoms in a sample of U- 238 to decay? b)If a sample of U-238 initially contained 1.9×1018

3. ## statistics

Thirty percent of the students in a high school face a disciplinary action of some kind before they graduate. Of those students, 40% go on to college. Of the 70% who do not face a disciplinary action, 60% go on to college. What percent of the students from

4. ## statistics

The average score on a standardized test is 500 points with a standard deviation of 50 points. What is the probability that a student scores between 450 and 600 on the standardized test?

5. ## math

Given a dilation with the origin O (0, 0), by observation determine the scale factor "K." DO, K = (5, 0) (10, 0) The dilation an expansion. true or false

6. ## physics

You are given a vector in the xy plane that has a magnitude of 94.0 units and a y component of -44.0 units. A. What are the two possibilities for its component? For this part I got x = 83.1 and -83.1 B. Assuming the x component is known to be positive,

7. ## physics

A 0.10 g plastic bead is charged by the addition of 1.0 x 1010 excess electrons. What electric field (strength and direction) will cause the bead to hang suspended in the air?

8. ## chem

a hard H20 contains 0.0085% Ca by mass(form Ca+ ions).How much H2O(g) contains 1.2g of Ca?

9. ## chem

density of 20% by mass C2H6O2 solution in water is 1.03 g/mL. find the molarity of the solution.

10. ## chemistry

Lakes that have been acidified by acid rain can be neutralized by the addition of limestone How much limestone in kilograms would be required to completely neutralize a lake containing of H2 per liter? 5.0 * 10-3 g SO4 5.2 *

11. ## Physics

An ant walks on a piece of graph paper straight along the x axis a distance of 10.0 cm in 2.00 s. It then turns left 30.0 degrees and walks in a straight line another 10.0 cm in 1.90 s. Finally, it turns another 70.0 degrees to the left and walks another

12. ## English 12

Many critics see Robert Browning as a "psychological poet," who is more modern than other Victorian writers.In what sense is "My Last Duchess" an exploration of abnormal psychology and human evil? How does Browning convincingly portray the complexity of

13. ## math

how to find the slope of the curve 17x^2+12xy=100-8y^2 at the point where y=1. -i already d/dx but i didn't know how to find the slope of curve bcus they only give y. d/dx=(-34x-12y)/(12x+16y)

14. ## Chemistry

Sodium carbonate reacts with hydrochloric acid as shown in an unbalanced chemical equation. What mass of Co2 is produced from the reaction of 2.94g Na2 Co2 with excess HCI? Na2CO3(s)+HCI(aq)+ CO2(g)+H2O A. 1.22 g B. 2.44 g C 2.94 g D 5.88 g E 7.08 g

15. ## chem

an aq. solution(NaCl) made by using 133g diluted to a total solution volume of 1 L.Calculate the molarity, molality & mass % of the solution(density of solution = 1.08g/mL) [ans: M=1.92M, m=2.0m, 10.4 %] i need the calculation work bcus my ans is

16. ## math

A reflection maps the point (2, 3) to the point (-2, 3). It is a reflection over the

17. ## statistic

The average score on a standardized test is 750 points with a standard deviation of 50 points. If 2,000 students take the test at a local school, how many students do you expect to score between 700 and 800 points?

18. ## chemistry

For Ethanol, change in H vapor = 38.7 kj/mol at 78 degrees Celsius, it's boiling point. Calculate change in S for the vaporization of 1.00 mol ethanol at 78 degrees celsius and 1.00 atm pressure

19. ## physics

A clock has its second hand 2 cm long. What will the average velocity of the tip of the second hand in 15 seconds.

Assume that the population of heights of male college students is approximately normally distributed with mean  of 69 inches and standard deviation  of 3.75 inches. Show all work. (A) Find the proportion of male college students whose height is

21. ## chemistry

How much CuSO4-5H2O is needed to make up 500 ml of 2.5 M CuSO4

22. ## statistic

solve the problem :score a test are normally distributed with a mean of 68.2 and a standard deviation of 10.4 estimate the probablility that among 75 randomly selected students, at least 20 of them score greater than 78

23. ## chemistry

What volume of 14 N H2SO4 is needed to make 250 ml of 3.2 N H2SO4 solution?

24. ## math

For the transformation T, what is T-1? T : (x, y) (x + 4, y + 3) T-1: (x, y)

25. ## geometry

Given that triangles KON and LOM are similar, find the scale factor

26. ## statistics

If one card is randomly picked from a standard deck of 52 cards, the probability that the card will be a number from 2 through 10, or a Heart, or both, is: a. 51.9% (27/52) b. 69.2% (36/52) c. 76.9% (40/52) d. 94.2% (49.52)

27. ## CALCULUS!

Consider the function f(x)=4x^3–2x on the interval [–2,2]. Find the average or mean slope of the function on this interval. __14__ By the Mean Value Theorem, we know there exists at least one c in the open interval (–2,2) such that f(c) is equal to

28. ## maths trigonometry

sin (60 degrees + theta)-cos(30 degrees - theta)is equal to (A)2 cos theta (B)2 sin theta (C)theta (D)1 could u plz explain this answer thank you

29. ## math

how to find the slope of the curve 17x^2+12xy=100-8y^2 at the point where y=1. -i already d/dx but i didn't know how to find the slope of curve bcus they only give y. d/dx=(-34x-12y)/(12x+16y)

30. ## Chem 104

The reaction of 2.30g N2 with excess H2 produces 2.00g NH3. The percent yield of this reaaction is?

31. ## Chemistry

At 25 degrees celsius,one cm3 of iron mass of 7.62 grams. What volume of iron is occupied by 125 grams of iron

32. ## Physics

An ant walks on a piece of graph paper straight along the x axis a distance of 10.0 cm in 2.00 s. It then turns left 30.0 degrees and walks in a straight line another 10.0 cm in 1.90 s. Finally, it turns another 70.0 degrees to the left and walks another

33. ## Math

A person spins the pointer and is awarded the amount indicated by the pointer. (A circle with 3 sections divided: \$2, \$5, \$10). The pointer stops on \$2. It costs \$6 to play the game. Determine: a.) The expectation of a person who plays the game. b.) The

34. ## Geometry

Tell if the measures 9,11, and 7 can be side lengths of a triangle. if so, classify the triangle as acute, right, or obtuse?

35. ## English

Please check my work: Proofread the passage looking for grammar, puntuation, and spelling errors. Most students do not like english class. They think think its a waste of there time and energy. An't nobody likes to right papers and take tests anyway? Me

36. ## CALCULUS HELP !

f(x)=(-3x^3-x^2-9x-8)/(6x^2+4x+3. Find the equation of the non-vertical asymptote. y= Does f(x) intersect its non-vertical asymptote ? What is the smallest value of x at which f(c) intersects its non-vertical asymptote ? please show all the work. I did

37. ## physics

The energy needed to raise a load of mass 10 kg is 100 J. The height of the load at the end of the process is

38. ## MATLAB

I got another MATLAB question that I seem to be struggling with. Use two separate input statements to prompt a user to enter his or her first and last names. Use the disp function to display those names on one line. (You'll need to combine the names and

39. ## human resources

Need some help developing a 5 year career plan to be an HR Cooridnator. I am a Data manager for the last 8 yrs. In school now for my BS in Business Management will finish in January 2012. Start Master in July of 2012. A mother of 2. See below for the

40. ## CHEMISTRY

Discuss in detail the healthcare applications of chemical reactions. Which chemical reactions would you consider to be of importance to healthcare professionals? Why? In which situations are these chemical reactions useful to healthcare professionals?

41. ## marketing

Identify one way in which the role of the agency and the product or service it regulates or oversees affects consumer choice in the health care marketplace. Identify health care costs for consumers. Identify factors that contribute to the consumer’s

42. ## calculus

4. a. Estimate the area under the graph of f(x)=sqrt(x^2+4) from x=0 to x=2 using four rectangles and right endpoints.

43. ## chemistry

suppose 5.00g of sodium carbonate reacts completely with excess of hydrochloric acid. Show how to calculate the mass (g) of sodium chloride that would be formed. Na2CO3 + 2HCl = 2NaCl + CO2 + H2O What is the limiting reagent?

44. ## algebra

Essay. Show all work. Find the quotient. 49a^2-b^2 --------- 7a-b

45. ## Math

A person spins the pointer and is awarded the amount indicated by the pointer. (A circle with 3 sections divided: \$2, \$5, \$10). The pointer stops on \$2. It costs \$6 to play the game. Determine: a.) The expectation of a person who plays the game. b.) The

46. ## geometry

ABCD is a parallelogram. Angle B is equal toand angle D is equal toFind x

47. ## Geometry

M is the midpoint of segment AN, A has coordinates (-6,2) and M has coordinates (-1, -3). What are the coordinates of N?

48. ## Math

One thousand raffle tickets are sold for \$4.00 each. One grand prize of \$800 and two consolation prizes of \$100 each will be awarded. Jeremy purchases one ticket. Find his expected value.

49. ## Chemistry

A 55 yr old woman goes to lunch and has a bacon, cheese pizza and 3 large sodas. She is on her way home and gets heartburn, abdominal pain, and difficulty breathing. She drinks lots of water and consumes milk of magnesia to feel better.What should the

50. ## math

A gardener wants to create a rectangular garden with length of 8x - 4y ft. and width of 5x + 9y ft. What is an algebraic expression for the area of the garden?

51. ## Strayer University

a dog-food company makes a special kind of dog food. It consists of 10% meat powder and 90% grain. The meat powder cost 80 cents per pound. The grain costs 70 cents per pound. What is the cost of the new materials per pound of dog food?

52. ## chemistry

is the melting point determination of crude benzoic acid recyustalization is higher or lower?

53. ## algebra

Given the function f(x) = 3x + 16, evaluate f(19)

the problem asks to complete an ANOVA table and report the relevant SS, df, MS, and F values, and find the critical value for the F-values. I found my F values: they were 3 and 16. I do not understand how to find the critical value.

55. ## math

Ed buys a car on credit . He makes a down payment of \$1,500 and pays \$250 per month for 36 months. What is the finance charge if the cash price on the car is \$9,500

56. ## HRM

what is different between staffing and HRM?

57. ## marketing

Identify one way in which the role of the agency and the product or service it regulates or oversees affects consumer choice in the health care marketplace. Identify health care costs for consumers. Identify factors that contribute to the consumer’s

58. ## Geology

How did the Hawaiian Islands form geologically? How could the relative age of the islands be determined? (In other words, how would you know which island was oldest, which was youngest, etc.)?

59. ## Calculus

3 numbers x y and z are to bea randomly chosen between 0 and 1. A What is the probability that X + y + z will be less than 1? B What is the probability that both x+ y

60. ## math

find the eqt. of the tangent to the curves at (1,2). y^3+y^3=9(xy-1) [ans: y=5x-5] could some1 show me the calculation work bcus my ans is y=(6x+4)/5.

61. ## Math for pharmacy Tech

My daughter Kim teaches and notes that the average student uses 75 sheets of paper every week. A) How many sheets will a student use in a 42-week school year? B) How many sheets will a class of 26 students use in a week? Not sure how to approach the

62. ## statistics

The following information is available. H0: μ ≤ 10 H1: μ> 10 The sample mean is 12 for a sample of 36. The population standard deviation is 3. Use the .02 significance level.

63. ## geometry

this one is killing me for some reason: Find any of the values of k so that (-3, 4), (-8,5), and (-5, k) are the verticles of a right traingle.

64. ## geometry

based on the data in your table and the scatterplot write and equation for the width of the rectangle in the terms of the legth

65. ## physics

Is the mass of an object has an effect velocity with it land on the ground when freely falling from rest?

66. ## maths trigonometry

if sin A + sin^2 A = 1, then the value of cos^A + cos^4 A is (A) 2 (B) 1 (C) -2 (D) 0

67. ## geometry

One equilateral triangle has sides 5 ft long. Another equilateral triangle has sides 7 ft long. Find the ratio of the areas of the triangles

68. ## Criminal law

During a trial, both the prosecutor and the defense attorney may __________ to questions asked by the other party. (Points: 5) request a judgment object ask for a recess tell the person not to respond I think its B

69. ## criminal law

The __________ Amendment gives a defendant the right to remain silent. (Points: 5) Sixth Fourth Fifth Third it think its "Fifth"

70. ## algebra

Essay. Show all work. Find the quotient y^4+3y-1 -------- y^2-3

71. ## CALCULUS!

f(x)=(6x^3–9x^2–3x–1)/(4x^2+7x–3) . Find the equation of the non-vertical asymptote. y = ____3x/2 - 39/8_____ Does f(x) intersect its non-vertical asymptote? (yes or no) ___YES____ What is the smallest value of x at which f(x) intersects its

72. ## algebra

find the product. (x+3)(x^2-3x+9)

73. ## algebra

find the product. (4x+4y)^2

74. ## geometry

can 19cm,9cm,11cm construct a triangle

75. ## English

In the following paragraph where are the linking verbs? And is the punctuation correct? My Chinese pug, Pooh, is a whole lot of dog in a very compact package. Even though she is only twelve inches tall and weighs just over 18 pounds, she seems to have the

76. ## college algebra

-4x^2y(-4x^3y^5)

77. ## algebra

Short answer. Find the quotient: 6x^3-x^2-7x-9 ------------- 2x+3

78. ## math algebra

find the following product 7z (3z^3 - 2z+ 4)

79. ## Geometry

Can a triangle have sides with lengths 7, 13, and 9?

80. ## Spanish

What are common Spanish street suffixes (like Street = Calle)?

81. ## com 155

Review the passage below, which contains 20 errors. Identify these errors by marking each of the errors in bold, and make your correction in parentheses after the error. Example: My cars interior is black. This must be marked as follows: My cars (car’s)

82. ## Math

For Reiny:What step did I do wrong.(Help) (x-4x^3)^2 =(x-4x^3)(x-4x^3)=(x)(x)+(x)(-4x^3)+(-4x^3)(x)+(-4x^3)(4x^3) = x^2-4x^4-4x^4-16x^6 =x^2-8x^4-16x^6

83. ## physics

What is the dimension of current

84. ## maths - statistics

find the mode of the fdllowing data class - 0-20 20-40 40-60 60-80 frequency -15 6 18 10 plz explain this sum thank you

85. ## Computers Excel 2007

Performing what if analysis

86. ## English

Can you please check these sentences on phrasal verbs, please? Thank you very much in advance. (I don't know if their use is correct). 1) The plane will lift off at 9.00 o'clock. 2) They will head off at six a.m. tomorrow. 3) He cleared off without saying

87. ## early childhood literacy

considering storybooks withelectronic features educators believe that

88. ## math

man drives for a time at 20 mph. then for a time at 45 mph.he drives 25 mi. he drives 50 min. . how many miles did he drive 20 mph ?

89. ## Geometry

the lengths of 2 sides of a triangle are 2 inches and 10 inches. find the range of possible lengths for the third side, s.

90. ## coms 285

What are the three most important points a group must keep in mind when working collaboratively on a writing project? Why? Support your response with references to the readings and personal experiences.

92. ## Physics

Why is there a centripetal acceleration if the velocity does not increase? a. Velocity changes direction as you move around the circle, causing a Δv b. Velocity in a circle is always constant c. Because gravity will hold any object in a circular motion I