Leanna

Most 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,

    asked on March 3, 2013
  2. 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?

    asked on March 8, 2013
  3. 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?

    asked on November 10, 2011
  4. 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

    asked on February 6, 2017
  5. 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.

    asked on March 3, 2013
  6. 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

    asked on March 26, 2016
  7. 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

    asked on April 1, 2013
  8. 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

    asked on February 7, 2011
  9. worksheet help

    what was unusual about the horse breeding magazine

    asked on March 9, 2009
  10. 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

    asked on January 26, 2011
  11. 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?

    asked on November 10, 2011
  12. 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?

    asked on March 24, 2013
  13. 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

    asked on March 7, 2015
  14. 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

    asked on November 29, 2010
  15. Calc

    When pi/2

    asked on July 15, 2011
  16. 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

    asked on January 20, 2011
  17. 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?

    asked on March 21, 2013
  18. 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

    asked on January 19, 2016
  19. 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?

    asked on October 6, 2013
  20. 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?

    asked on January 17, 2012
  21. 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

    asked on December 9, 2015
  22. 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

    asked on March 24, 2013
  23. 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

    asked on February 9, 2011
  24. 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

    asked on March 31, 2013
  25. 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.

    asked on April 1, 2013
  26. 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

    asked on February 9, 2011
  27. 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

    asked on February 8, 2011
  28. 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

    asked on March 22, 2011
  29. 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.

    asked on September 18, 2012
  30. 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.

    asked on October 20, 2011
  31. 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

    asked on December 9, 2015
  32. 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

    asked on October 26, 2010
  33. 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

    asked on February 3, 2011
  34. 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

    asked on March 7, 2015
  35. Calculus

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

    asked on September 21, 2010
  36. 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

    asked on October 22, 2012
  37. 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?

    asked on October 16, 2011
  38. 12th Grade 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

    asked on October 27, 2010
  39. 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.

    asked on September 21, 2010
  40. 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

    asked on April 29, 2015
  41. Calculus

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

    asked on April 11, 2011
  42. 12th Grade Vocabulary

    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

    asked on November 21, 2010
  43. 12th Grade English

    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

    asked on November 21, 2010
  44. 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

    asked on September 12, 2010
  45. 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?

    asked on August 29, 2010
  46. 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

    asked on March 6, 2011
  47. 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?

    asked on September 21, 2010
  48. 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?

    asked on February 9, 2013
  49. math

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

    asked on January 18, 2013
  50. AP Calculus

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

    asked on March 23, 2011
  51. 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.

    asked on November 30, 2010
  52. 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

    asked on November 29, 2010
  53. 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

    asked on November 29, 2010
  54. 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.

    asked on September 21, 2010
  55. 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

    asked on September 12, 2010
  56. 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?

    asked on September 6, 2010
  57. Calculus

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

    asked on September 6, 2010
  58. 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).

    asked on September 6, 2010
  59. 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

    asked on August 29, 2010
  60. Art

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

    asked on September 24, 2013
  61. 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

    asked on March 6, 2012
  62. Algebra

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

    asked on April 11, 2011
  63. 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

    asked on March 23, 2011
  64. 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.

    asked on November 30, 2010
  65. 12th grade 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

    asked on October 5, 2010
  66. 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.

    asked on October 3, 2010
  67. 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!

    asked on September 12, 2010
  68. 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

    asked on September 6, 2010
  69. 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

    asked on August 29, 2010
  70. 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

    asked on October 2, 2006
  71. 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.

    asked on February 9, 2013
  72. 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

    asked on November 29, 2010
  73. 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

    asked on September 23, 2010
  74. 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

    asked on September 6, 2010
  75. 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).

    asked on September 6, 2010
  76. 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?

    asked on August 29, 2010
  77. 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,

    asked on November 6, 2006
  78. 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.

    asked on January 19, 2016
  79. math

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

    asked on September 24, 2013
  80. Calc

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

    asked on July 12, 2011
  81. Calculus

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

    asked on April 11, 2011
  82. Please Help! Calculus

    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

    asked on November 22, 2010
  83. 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

    asked on October 5, 2010
  84. 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

    asked on September 21, 2010
  85. 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

    asked on August 29, 2010
  86. Math AP Calc

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

    asked on August 29, 2010
  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
  13. Calculus

    Thanks for help on 1. on 2. if i do u=sqrt(x) my du is 1/2x^(-1/2) and that means my du is in the denominator. So it would read 2integral of sin(u)/du

    posted on April 11, 2011
  14. Calculus

    oh wow thank you so much!! that makes sense!!

    posted on April 11, 2011