# Leanna

Popular questions and responses by Leanna
1. ## Physics

A 20 kg crate is placed on a horizontal conveyor belt. The materials are such that us = 0.47 and uk = 0.21. What is the maximum acceleration the belt can have without the crate slipping? If acceleration of the belt exceeds the value determined in part A,

When pi/2

3. ## Calculus

A smokestack deposits soot on the ground with a concentration inversely proportional to the square of the distance from the stack. With two smokestacks d miles apart, the concentration of the combined deposits on the line joining them, at a distance x from

4. ## Physics

A 23 kg child goes down a straight slide inclined 38 degrees above horizontal. The child is acted on by his weight, the normal force from the slide, and kinetic friction.

5. ## Science Help!

How much heat is needed to cause the following irreversible reaction? 200 g of liquid H2O at 50°C is heated to form 200 g of steam at 120°C

6. ## math

You find a sales receipt from a store that shows the total price as \$40, and the total amount paid including sales tax as \$42. a. Write an equation you can use to find the sales tax rate which is r. what is the equation so I tried all things I could think

7. ## math

a woman had 400 oranges in a basket. after selling 1/5 of them, she found that 1/8 of the remainder were bad. how many of the remainder were good?

8. ## Math

Soundex produces x Model A radios and y Model B radios. Model A requires 15 min of work on Assembly Line I and 10 min of work on Assembly Line II. Model B requires 10 min of work on Assembly Line I and 12 min of work on Assembly Line II. At most, 25

9. ## social studies

How did minoans and Mycenaeans make a living? Who was Socrates most well known student? What was the name of the book plato wrote?

10. ## Calculus

The table below shows some values of a linear function f and an exponential function g. Fill in exact values for each of the missing entries. X 0 1 2 3 4 f(x) 25 375 g(x) 25 375

11. ## Calculus

Let f be a twice-differentiable function such that f(2)=5 and f(5)=2. Let g be the function given by g(x)= f(f(x)). (a) Explain why there must be a value c for 2 < c < 5 such that f'(c) = -1. (b) Show that g' (2) = g' (5). Use this result to explain why

12. ## Physics

A combination lock has a 1.2 cm -diameter knob that is part of the dial you turn to unlock the lock. To turn that knob, you grip it between your thumb and forefinger with a force of 0.62 N as you twist your wrist. Suppose the coefficient of static friction

13. ## Physics

The ultracentrifuge is an important tool for separating and analyzing proteins in biological research. Because of the enormous centripetal accelerations that can be achieved, the apparatus must be carefully balanced so that each sample is matched by

14. ## math

when a ball is dropped, it bounces back up 4/5 of the height from the height it was dropped.If the ball dropped from a height of 200cm, how high does it go after bouncing twice.

15. ## Organic Chemistry

I have the linear formula of CH3CH2OLi and I'm trying to draw the structure with charges. Not really sure how. Please help.

16. ## Algebra

How do you do long division of ((5x^4)-2)/(3x^2) _______ 3x^2|5x^4-2

17. ## chem

a 275mL sample of vapor in equilibrium with 1-propylamine at 25C is removed and dissolved in 0.500L of H20. For 1-propalamine, Kb=3.72*10^-4 and the vapor pressure at 25C is 215 torr. (a)What should be the pH of the aqueous solution? (b) How many mg of

18. ## AP Calculus

Consider the curve given by x^2+4y^2=7+3xy a) Show that dy/dx=(3y-2x)/(8y-3x) b) Show that there is a point P with x-coordinate 3 at which the line tangent to the curve at P is horizontal. Find the y-coordinate of P. c) Find the value of d^2y/dx^2 (second

19. ## Physics

Suppose you wish to make a vertical leap with the goal of getting your head as high as possible above the ground. At the top of your leap, your arms should be... a. held at your sides. b. raised above your head. c. outstretched, away from your body.

20. ## Physics

1. At what height above the earth is the free-fall acceleration 30% of its value at the surface? 2. What is the speed of a satellite orbiting at that height?

21. ## Physics

A fast-moving superhero in a comic book runs around a circular, 70-m-diameter track five and a half times (ending up directly opposite her starting point) in 3.0s. What is her angular speed, in rad/s?

22. ## Probability

With her box of 64 crayons, your little sister decides to draw a picture of the family: herself, you, and your parents. How many different ways could she find to give you all hair colors?

23. ## Probability

With her box of 64 crayons, your little sister decides to draw a picture of the family: herself, you, and your parents. How many different ways could she find to give you all hair colors?

24. ## Calculus

Let f be the function defined for x >or= to 0 with f(0)=5 and f', the first derivative of f, give by f'(x)=e^(-x/4)sin(x^2). A) Use the graph of f' to determine whether the graph of f is concave up, concave down, or neither on the interval 1.7

25. ## General Chemistry II

A quantity of ice at 0 degrees celcius is added to 64.3 grams of water in a glass at 55 degrees celcius. After the ice melted, the temperature of the water in the glass was 15 degrees celcius. How much ice was added? The heat of fusion of water is

26. ## Calculus - Still Need Help! Anyone!

A particle moves along the x-axis with position at time t given by x(t)=e^(-t)sin(t) for 0 is less than or equal to t which is less than or equal to 2 pi. a) Find the time t at which the particle is farthest to the left. Justify your answer I think you

We have to find the synonym of the word in bold. I have a few choices but I'm stuck between two.. The words in bold are incumbent upon the phrase reads: incumbent upon all officials Deciding to choose between a) the duty of b) the term of office of

28. ## Calculus (Reiny or MathMate)

A rational function g has the lines x=2 and x=-2 as vertical asymptotes, the line y=4 as a horizontal asymptote, and numbers 3 and 1 as zeros. Find a formula for g(x). So I got g(x)=(4x^2-16x+12)/(x^2-4) Is this correct

29. ## Math AP Calc

Label each statement TRUE or FALSE. a. The sum of two one-to-one functions is one-to-one. b. The product of two one-to-one functions is one-to-one. c. If f is a one-to-one function and k is a real number (constant), then the function g(x)=k*f(x)is

30. ## worksheet help

what was unusual about the horse breeding magazine

31. ## physics

Jenny has a mass of 33.6 kg and her skateboard has a mass of 1.5 kg. What is the momentum of Jenny and her skateboard together if they are going 9.50 m/s?

32. ## Calculus

Suppose that f(t)=Qoa^1=Qo(1+r)^t with f(4)=72.2 and f(10)=176.7. Find what a is and what r is.

33. ## Chemistry

A sample of nitrogen gas was collected via water displacement. Since the nitrogen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 21 °C is 1.16 atm, what is the partial pressure of

34. ## Chemistry

A sample of nitrogen gas was collected via water displacement. Since the nitrogen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 21 °C is 1.16 atm, what is the partial pressure of

35. ## math

Lee wants to cut this piece of canvas into two rectangles that are 3×2 and 3×5. He wants the sum of the two small recyangles to be the same as the area of the large rectangle. Can he do this? Explain the rectangle is 6feet across and 3feet tall

36. ## Chemistry :/

Experiment 1 results: mass of crucible 88g mass of hydrate 93g mass of salt 91.196g 1. Calculate the following: a:mass of water in the hydrate sample (g) b:number of moles of water in the sample c:mass of pure salt in the sample (g) d:number of moles of

37. ## Chemistry

Experiment 1 results: mass of crucible 88g mass of hydrate 93g mass of salt 91.196g 1. Calculate the following: a:mass of water in the hydrate sample (g) b:number of moles of water in the sample c:mass of pure salt in the sample (g) d:number of moles of

38. ## Physics

Two 2.9-cm-diameter electrodes with a 0.15-mm-thick sheet of Teflon between them are attached to a 9.0 V battery. Without disconnecting the battery, the Teflon is removed. a) What are the electric field after the Teflon is removed?

39. ## Art

I'm in art and i cant draw a bear do you have any tips?

40. ## math

I im learningabout fractions is there an faster or easier way i can do them?

41. ## Physics

A combination lock has a 1.2 cm -diameter knob that is part of the dial you turn to unlock the lock. To turn that knob, you grip it between your thumb and forefinger with a force of 0.62 N as you twist your wrist. Suppose the coefficient of static friction

42. ## Physics

A conical pendulum is formed by attaching a 0.60kg ball to a 1.0m -long string, then allowing the mass to move in a horizontal circle of radius 30cm. 1. What is the tension in the string 2. What is the ball's angular velocity in rpm?

43. ## math

how do you write 4/5, 5/12, 3/10 in its simpliest form?

44. ## Math

The size of a bacteria population is given by P=C*e^(kt) Where C is the initial size of the population, k is the growth rate constant and t is time in minutes. a) If the bacteria in the population double their number every minute, what is the value of k? I

45. ## Biology

You are supposed to add 0.1 mol of a substance with molecular weight = 354.9 to 1 liter of water. How much should you add? Choose one.

46. ## Biology

In goats, the allele for black hair is dominant to that for red. Two black haired goats mated, producing twelve offspring. Of the first eleven, 8 had black hair and 3 had red hair. What is the probability of the twelfth offspring having red hair?

47. ## Calc

I need help solving this problem. logbase5(x+2)=2

48. ## Calculus

I don't know how to do the integral of e^(lnx^2)dx and the integral of (sin sqrtx)/(sqrtx) dx

49. ## Calculus

I need help with integrals and I need help with the problem. Integral of 4/sqrt(x)dx

50. ## AP Calculus

I previously posted this but had a mistake in it. Determine dy/dx if xsiny=arctany i did (x)(cosy dy/dx)+(1)(siny)=dy/(1+y^2) so far

51. ## AP Calculus

Determine dy/dx if xsiny=artany i did (x)(cosy dy/dx) so far

52. ## AP Calculus

Find the total area enclosed by the graph of y=(e^sinx)*(cosx) and the x-axis from x=0 to x=pi I got .0563331993 but when I checked it graphically I got 3.22765

53. ## Calculus

A cubic polynomial function f is defined by f(x) = 4x^3 + ax^2 + bx + k? A cubic polynomial function f is defined by: f(x) = 4x^3 + ax^2 + bx + k where a, b, and k are constants. The function f has a local minimum at x= -1, and the graph of f has a point

54. ## Calculus

A cubic polynomial function f is defined by f(x) = 4x^3 + ax^2 + bx + k? A cubic polynomial function f is defined by: f(x) = 4x^3 + ax^2 + bx + k where a, b, and k are constants. The function f has a local minimum at x= -1, and the graph of f has a point

55. ## Physics

So for each of the statements we have to write true or rewrite the part in Caps to make the sentence true. I'm only stuck on a couple. 1. On a position-time graph, the average velocity equals the run MULTIPLIED by the rise. 2. A child drops a ball. The

56. ## Calculus

Find all points on the graph of f(x)=xe^x at which the tangent line is parallel to the line y-3x=4. i figured out that f'(x)=3 but i don't know what to do with that.

57. ## Calculus

Find all points on the graph of f(x)=xe^x at which the tangent line is parallel to the line y-3x=4. i figured out that f'(x)=3 but i don't know what to do with that.

58. ## Calculus!!!!

A particle moves along the x-axis with position at time t given by x(t)=e^(-t)sin(t) for 0 is less than or equal to t which is less than or equal to 2 pi. a) Find the time t at which the particle is farthest to the left. Justify your answer I think you

59. ## Calculus

A particle moves along the x-axis with position at time t given by x(t)=e^(-t)sin(t) for 0 is less than or equal to t which is less than or equal to 2 pi. a) Find the time t at which the particle is farthest to the left. Justify your answer I think you

60. ## Calculus

A particle moves along the x-axis with position at time t given by x(t)=e^(-t)sin(t) for 0 is less than or equal to t which is less than or equal to 2 pi. a) Find the time t at which the particle is farthest to the left. Justify your answer I think you

We have to find out which of these statements are true. I narrowed it down to 2 answers. a) if f"(0)=0, the the graph of f changes concavity at x=0 b) If the function f is continuous on the interval [a,b] and the integral from a to b of f(x)dx=0, then f

We have to pick which sentence the vocabulary word is used incorrectly. Vocab Word: Verity a) Many people trusted the VERITY of the accused spies Ethel and Julius Rosenberg, but the defendants were convicted and executed for espionage in 1953. b) Although

When a ball is thrown straight down from the top of a tall building, with initial velocity 30 ft/sec, the distance from the release point at time t in seconds is given by s(t)=16t^2+30t. If the release point is 300 ft above ground, what is the velocity of

64. ## Calculus

When a ball is thrown straight down from the top of a tall building, with initial velocity 30 ft/sec, the distance from the release point at time t in seconds is given by s(t)=16t^2+30t. If the release point is 300 ft above ground, what is the velocity of

It says find the numbers, if any, at which the given function is discontinuous. f(x)=abs(x+2) *abs - absolute value f(x)=e^xsinx for both of these problems i saw that it was continuous but i don't really know

66. ## Calculus

It says find the numbers, if any, at which the given function is discontinuous. f(x)=abs(x+2) *abs - absolute value f(x)=e^xsinx for both of these problems i saw that it was continuous but i don't really know

67. ## US Government

Society operates more efficiently if government power is centralized. What reasons exist for continuing federalism in its current form? In other words, defend a federal system of government.

68. ## English - Beowulf

So we just started reading Beowulf at school and we're around ch 8. Our question to answer was Whose account of Beowulf and Brecca's swimming match is more credible/believable and why? This is referring to Unferth's and Beowulf's stories. I said that

69. ## American Government

I have to do a 5 minute presentation on George Washington and I have to focus on his contributions towards the Constitution. All the sites I go to have pretty much the same information. Does anyone have sites that could help me?

70. ## Calculus, need help again...

If the function f is defined by f(x)=x^2-2x, find limit h->0 (f(3+h)-(f(3-h))/2h

71. ## Caclulus, bobpursley HELP!

Sorry for bothering you on this one question but I just replied to my original problem if you could help me with that.

72. ## Calculus, bobpursley!

This has to do with my last Calculus problem. I need help on it..The part I replied to after you answered the question.

73. ## Calculus

If the function f is defined by f(x)=x^2-2x, find limit h->0 (f(3+h)-(f(3-h))/2h

74. ## Calculus..Need Help Soon

If the solutions of f(x)=0 are 1 and -2, then the solutions of f(2x)=0 are a)1 and 2 b) 1/2 and -1 c) 2 and -4 d)-2 and 4 2)-1/2 and -1

75. ## Calculus..Need Help Soon

If f(x)=1-x^3 and f^-1 is the inverse of f, how many solutions does the equation f(x)=f^-1(x) have? a)none b)one c)three d)five e)six

76. ## Calculus..Need Help Soon

If x=1 and x=2 are zeros of f(x)=3X^3+Ax^2+Bx+2, then the value of A+B is a)1, b)-1, c)9, d)-9, e) cannot be determined I think it can't be determined but i don't know!

77. ## Math

A rational function g has the lines x=2 and x=-2 as vertical asymptotes, the line y=4 as a horizontal asymptote, and numbers 3 and 1 as zeros. Find a formula for g(x). So I got g(x)=(4x^2-16x+12)/(x^2-4) Is this correct

78. ## Calculus

A rational function g has the lines x=2 and x=-2 as vertical asymptotes, the line y=4 as a horizontal asymptote, and numbers 3 and 1 as zeros. Find a formula for g(x). So I got g(x)=(4x^2-16x+12)/(x^2-4) Is this correct Math Mate?

79. ## Calculus

Solve for x if 5+lnx=14/lnx.

80. ## Calculus

A rational function g has the lines x=2 and x=-2 as vertical asymptotes, the line y=4 as a horizontal asymptote, and numbers 3 and 1 as zeros. Find a formula for g(x).

81. ## Calculus

If f is a polynomial function of degree 3 with the numbers 4,5, and -6 as zeros, and if f(1)=-210, determine the formula for f(x).

82. ## Math-Reiny Help! Previous Problem

In 1951, the population of India was 357 million people. By 1981 it had grown to 984 million. If the population is growing exponentially, when (in what month of what year) will the population reach 1 billion people? How do you know it's the 6th month?

83. ## Math

In 1951, the population of India was 357 million people. By 1981 it had grown to 984 million. If the population is growing exponentially, when (in what month of what year) will the population reach 1 billion people? How do you know what month? -Reiny

84. ## Math, Still Need Help!

Label each statement TRUE or FALSE. a. The sum of two one-to-one functions is one-to-one. b. The product of two one-to-one functions is one-to-one. c. If f is a one-to-one function and k is a real number (constant), then the function g(x)=k*f(x)is

85. ## Math AP Calc

The population of New Hampshire was 1 million in 1990. It doubles every 25 years. Estimate the population in 1996.

86. ## Math AP Calc

In 1951, the population of India was 357 million people. By 1981 it had grown to 984 million. If the population is growing exponentially, when (in what month of what year) will the population reach 1 billion people?

87. ## Microeconomis

Why is much more profitable for a company to bring to market a new product than secon? While your statement is generally true, it is not always true. The producer of a new product MAY enjoy some monopoly power for a time. Makers of an existing product are,

88. ## Earth Science

What are 3 examples of graphing natural phenomenas? How would you predict their future occurences? One could graph the occurance of celestial bodies, such as the moon, sun, etc. Or graph the location of Vega, by hour. Or graph comets. You could graph

1. ## Math

144

posted on June 2, 2018
2. ## Chemistry

idk man

posted on February 27, 2018
3. ## algebra

The cost in dollars, C, of renting a carpet cleaner is given by the linear equation C = 20 + 25x, where x is the number of days. Use this model to find the cost of renting the unit for 11 days.

posted on October 6, 2015
4. ## Chemistry :/

Formulas for experiment 1: CuSO4*5H2O CuSO4.XH2O --------> CuSO4 + XH2O Formulas for experiment 2: MgCl2·6H2O MgCl2 * X H2O = MgCl2 + X H2O I just need someone to check my answers please :)

posted on March 7, 2015
5. ## Chemistry :/

These are the calculations I can up with for experiment 1: a:mass of water in the hydrate sample (g) 1.804g b:number of moles of water in the sample 0.100g c:mass of pure salt in the sample (g) 3.196g d:number of moles of salt in the sample .0214g e:molar

posted on March 7, 2015
6. ## math

There are 144 perfect pumpkins.

posted on October 26, 2013
7. ## math

OH THATS EASY XD well how much is in a millimeter? you need to find that out then..............yea that's all i got i think you x the number of what you got of the milliter and x it by 30

posted on September 24, 2013
8. ## math

MRS SUE ty for your time o.o

posted on September 24, 2013
9. ## Physics

(23kg)(9.8m/s^2)(cos(38)) = 177.6N

posted on March 3, 2013
10. ## Grammar MT

It actually depends on account instructions on dropping the 's. Both are correct.

posted on April 23, 2012
11. ## Biology

The options are: 3.549 g 35.49 g 35.49 mg 0.1 g 0.1 mg

posted on October 20, 2011
12. ## Calc

Thank you so much!

posted on July 12, 2011