Popular questions and responses by robin
  1. Chemistry

    Explain why the solubility of PbF2 is pH dependent, but the solubility of PbCl2 is not. I know the solubility of PbF2 is pH dependent because the solubility would increase as the solution becomes more acidic because the F^- ion is the conjugate weak base

    asked on April 11, 2016
  2. Algebra

    Form a third degree polynomial function with real coefficients such that -7 + i and -9 are zeros

    asked on March 21, 2016
  3. Physics

    Some insects can walk below a thin rod (such as a twig) by hanging from it. Suppose that such an insect has mass m and hangs from a horizontal rod as shown in the figure, with angle θ = 37°. Its six legs are all under the same tension, and the leg

    asked on February 17, 2014
  4. Statistics

    A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week. Assuming a standard deviation of 3 hours, what is the required sample size if the error should be

    asked on September 5, 2010
  5. math


    asked on July 13, 2020
  6. math

    how to find slope and graph y+3=1/2(x+2)

    asked on July 23, 2020
  7. Calculus

    A rancher wants to make a rectangular pen to house her animals. She will divide it up with 3 fences down the middle parallel to one side. If she has 14000 ft of fencing to work with, what are the dimensions of the pen of greatest area? Width = Length =

    asked on July 13, 2013
  8. math

    write the phrase as an expression... 7 more than the quotient of a number y and 5

    asked on October 24, 2017
  9. Calculus

    Gravel is being dumped from a conveyor belt at a rate of 10 cubic feet per minute. It forms a pile in the shape of a right circular cone whose base diameter and height are always equal. How fast is the height of the pile increasing when the pile is 16 feet

    asked on July 5, 2013
  10. Chemistry!! Please help!

    If the wavelength of line B is 142.5 nm, calculate the wavelength of line A. Line A is the transition of n=6 to n=3 Line B is the transition of n=5 to n=3

    asked on October 21, 2008
  11. College Algrebra

    Joel can run around a 1/4 mi track in 66 sec. Jason can run around the track in 60 sec.If the runners start at the same point on the track and run in opposite directions, how long will it take the runners to cover 1/4 mile?

    asked on January 25, 2016
  12. physics

    a geosynchronous satellite orbits at a distance from earth's center of about 6.6 earth radii and takes 24 h to go around once. what distance in meters does the satellite travel in one day? what is its orbital velocity in m /s?

    asked on November 25, 2010
  13. math

    a color printer prints 28 pages in 12 minutes. How many pages does it print per minute

    asked on December 3, 2018
  14. English 2

    Water that aids digestion is really true.Identify the function of the noun clause.

    asked on February 4, 2015
  15. Physics

    A roller coaster has a mass of 425 kg. It sits at the top of a hill with height 66 m. If it drops from this hill, how fast is it going when it reaches the bottom? (Assume there is no air resistance or friction.)

    asked on May 14, 2013
  16. Geology

    There is also a graph i can't move it. Building Isochrons and Determining the Ages of Three Rocks Page 15 of 17 For each of the three rocks listed below follow these steps to determine the rock's age of formation. 1. Prepare an isochron by plotting the

    asked on January 12, 2013
  17. math

    Matthew used 1/5 of a box of flour for cooking and 3/4 of the remainder to make bread. The rest of the flour was packed equally into 5 containers. What fraction of the total amount of flour was in each container?

    asked on March 7, 2018
  18. Calculus

    Find the point on the line 7x+5y−2=0 which is closest to the point (−6,−2).

    asked on July 13, 2013
  19. Calculus

    A cable hangs between two poles of equal height and 40 feet apart. At a point on the ground directly under the cable and x feet from the point on the ground halfway between the poles the height of the cable in feet is h(x)=10+(0.4)(x^1.5). The cable weighs

    asked on October 19, 2013
  20. math

    3 pumps, working 6 hours a day, can empy a water tank in 2 days. How many hours a day must 9 pumps work to empty the same tank in 1 day?

    asked on January 26, 2013
  21. math

    A gallon jug of milk is 3/4 full. After breakfast the jug is 1/12 full. Find the difference of the amounts before breakfast and after breakfast.

    asked on October 22, 2018
  22. Calculus

    According to the National Health Survey, the heights of adult males in the United States are normally distributed with mean 69.0 inches and standard deviation 2.8 inches. A. What is the probability that an adult male chosen at random is between 61 inches

    asked on November 3, 2013
  23. Calculus

    Evaluate the integral below by interpreting it in terms of areas. In other words, draw a picture of the region the integral represents, and find the area using geometry. ç6 −6 36−x^2dx

    asked on July 15, 2013
  24. Physics true false

    true false The speed of a particle is always positive. True False The average speed of a particle is equal to the magnitude of its average velocity. True False The acceleration of a particle can be non-zero when its speed is constant. True False When the

    asked on February 26, 2013
  25. physics

    a geosynchronous satellite orbits at a distance from earth's center of about 6.6 earth radii and takes 24 h to go around once. what distance in meters does the satellite travel in one day? what is its orbital velocity in m /s?

    asked on November 25, 2010
  26. Database design

    How can you conduct evaluation and revision within the SDLC and DBLC frameworks? Maybe try here: Thanks Lance but I do not find what I need there, or if it is I

    asked on July 25, 2006
  27. Chemistry

    Adding 1.00 g of benzene, C6H6, to 80 g of cyclohexane, C6H12, lowers the freezing point of the cyclohexane from 6.5 to 3.3 degree celsius. What is the value of kf for cyclohexane?

    asked on December 2, 2015
  28. Calculus

    Two cars start moving from the same point. One travels south at 60 mph and the other travels west at 25 mph. At what rate is the distance between the cars increasing 2 hours later? Let x = the distance covered by the south traveling car. Let y = the

    asked on June 28, 2013
  29. math

    R. H. Bruskin Associates Market Research found that 30% of Americans do not think that having a college education is important to succeed in the business world. If a random sample of five Americans is s selected, find these probabilities. (a) Exactly two

    asked on June 20, 2013
  30. Enlgish, possessive form of singular and plural no

    possessive form of family, brother, suitcase, child, government, pen, train, tree, woman, refugg, families, brothers, suitcases, children, governments, pens, trains, trees, women,refugees

    asked on October 25, 2012
  31. psychology

    Identify intervention strategies to deal with burnout

    asked on August 15, 2012
  32. Chemistry AP

    what does this mean (we are on quantum) The figure below represents part of the emission spectrum for a one-electron ion in the gas phase. All the lines result from electronic transmissions from excited states to the n = 3 state. the graph is like this A B

    asked on October 21, 2008
  33. math

    A car averaged 48 miles per hour traveling 672 miles from Washington to Orlando. How long was the trip?

    asked on April 13, 2020
  34. math

    s+1/4=4/8 solve the proportion

    asked on March 4, 2019
  35. math

    Jay spent 6 hours playing games, studying and talking with his friends. he spent 2/5 of the time playing games and 1/2 of the time studying. how many minutes did he spend talking with his friends?

    asked on February 27, 2019
  36. math

    In the continental United States, the ratio of states that border an ocean to states that do not border an ocean is 7 : 9. How many of the states border an ocean?

    asked on November 27, 2018
  37. math

    you spend $16 on 3 notebooks and x binders. Notebooks cost $2 each and binders cost $5 each. Write an equation you can use to find the number of binders you bought.

    asked on February 12, 2018
  38. Algebra

    In a large city, taxicabs charge $4.00 for the first one-fifth mile and 0.38 for each additional one- fifth mile. Frank has only $8.50. What is the maximum distance he can travel?

    asked on October 21, 2017
  39. algebra

    how do you simplify (sqrt18)over(sqrt8)-3? And (4-3sqrt2)squared? I tried but get some unreal answer. thanks in advance.

    asked on March 24, 2015
  40. MATH

    Create a graph of a function given the following information: The instantaneous rate of change at x = 2 is zero. The instantaneous rate of change at x = 3 is negative. The average rate of change on the interval 0

    asked on July 19, 2013
  41. Calculus

    Find the absolute maximum and the absolute minimum values of f(x)=x−7cos(x) on the interval [−ð,ð).

    asked on July 7, 2013
  42. Math

    Rearrange this expression into quadratic form, ax2 bx c = 0 0.20= ((x^2)/(55-x)) where a = 1, and identify the values of b and c.

    asked on February 18, 2013
  43. chemistry

    The vapor pressure of water @ 80 degrees C is 0.467 atm. Find value of Kc for the reaction H2O(l) to H2O(g) @ this temp.

    asked on October 9, 2011
  44. PHYSICS ---HELP!

    A man doing push-ups pauses. His mass is 80-kg. Determine the normal force exerted by the floor on each hand and on each foot. a = 40 cm b = 95 cm c = 30 cm W = mg = 784 N

    asked on November 2, 2010
  45. math

    PV=nRT solve for T

    asked on May 29, 2020
  46. math


    asked on May 26, 2020
  47. math

    you buy a ring box as a birthday gift that is in the shape of a triangular prism. What is the least amount of wrapping paper needed to wrap the box? The lengths of the box are 14.5 cm, 8 cm, 10 cm, 10.5 cm

    asked on March 21, 2019
  48. math

    The ratio of the side lengths of a triangle is 2 : 3 : 4. The shortest side is 15 inches. What is the perimeter?

    asked on November 27, 2018
  49. math

    6 1/2 - 7/8 divided by 5 11/16

    asked on September 27, 2018
  50. math

    you are creating identical candy bags using 18 chocolate bars and 30 peanut butter cups. What is the greatest number of bags you can fill using all the candy

    asked on June 11, 2018
  51. math

    Your bedroom is in the shape of a square that is 12 feet long on each side. Will a circular rug with a circumference of 40.82 feet fit into your room? If not, by how many feet is the rug too wide?

    asked on March 21, 2018
  52. math

    on a 10 question quiz you correctly answer four one point questions and five two point questions. you earn 87.5% of the possible points on the quiz. a. how many possible points is the quiz worth b. how many questions did you miss c. how many points was

    asked on March 1, 2018
  53. math


    asked on February 28, 2018
  54. math

    Two vertices of a triangle are F (1, −4) and G(6, −4). List two possible coordinates of the third vertex so that the triangle has an area of 20 square units.

    asked on February 5, 2018
  55. math

    jill has 8 yards of cloth. she wants to cut it into pieces that are 1/4 yard long. How many pieces can she cut from the length of cloth

    asked on January 10, 2018
  56. math


    asked on December 4, 2017
  57. Math

    Is -n always, sometimes, or never a positive number? Explain. I don't know what they mean by -n - is a negative number?

    asked on September 1, 2016
  58. math

    Bass: The bass in Clear Lake have weights that are normally distributed with a mean of 2.3 pounds and a standard deviation of 0.6 pounds. (a) If you catch one random bass from Clear Lake, find the probability that it weighs less than 1 pound? Round your

    asked on October 26, 2015
  59. geometry

    Given m

    asked on April 6, 2015
  60. Statistics

    Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability of success on a single trial, n=9, x=2, p=0.35.

    asked on August 25, 2014
  61. albebra

    solve arithmetically and algebraically. The perimeter of a rectangle is 54 cm. Its length is 6 cm. What is its width?

    asked on April 14, 2014
  62. business communication CO210

    Prepare a one-page description of your plans to solve the problem for one of the following research studies. Use the following headings for the problem:

    asked on April 8, 2014
  63. Physics

    For the vectors with a = 3.3 and b = 2.2, what are (a) the z component of AxB, (b) the z component of AxC, and (c) the z component of BxC?

    asked on February 9, 2014
  64. Physics

    In the sum A+B=C, vector A has a magnitude of 10.2 m and is angled 48.0° counterclockwise from the +x direction, and vector C has a magnitude of 15.0 m and is angled 22.0° counterclockwise from the -x direction. What are (a) the magnitude and (b) the

    asked on February 9, 2014
  65. Physics

    A particle starts from the origin at t = 0 and moves along the positive x axis. A graph of the velocity of the particle as a function of the time is shown in the figure; the v-axis scale is set by vs = 7.0 m/s. (a) What is the coordinate of the particle at

    asked on February 5, 2014
  66. Calculus

    How can I get partial sums of a series on a TI 89 calculator?

    asked on November 26, 2013
  67. Calculus

    Calculate 20 terms for the sequence P0=-.5 and k=1.8, P0=.5 and k=2.8, and P0=.3 and k=1.8. Does the limit depend on the choice of P0? Does it depend on the choice of k?

    asked on November 25, 2013
  68. Calculus

    Solve the separable differential equation 10x−6ysqrt(x^2+1)dy/dx=0. with the initial condition y(0)=4.

    asked on November 18, 2013


    asked on November 5, 2013
  70. Calculus

    A) Find the average value of f(x)=x^3-x+1 on the interval (0,2) B) Find c so that f(c)equals the average value

    asked on November 3, 2013
  71. statistics

    a sample of 50 women is obtained and their heights (in inches) and pulse rates (in beats per min) are measured. the linear correlation coefficient is 0.229 and the equation of the regression line y= 17.9 +0.870x where x represents hight. the mean of the 50

    asked on October 22, 2013
  72. Calculus

    Determine whether the integral is divergent or convergent. If it is convergent, evaluate it. If it diverges to infinity, state your answer as INF. If it diverges to negative infinity, state your answer as MINF. If it diverges without being infinity or

    asked on October 20, 2013
  73. Calculus Please Help??

    Evaluate the integral (3x^2-16x-19)/(x^3-4x^2-3x+18)

    asked on September 27, 2013
  74. Calculus

    Snow is falling vertically at a constant rate of 8.0 m/s. At what angle from the vertical do the snowflakes appear to be falling as viewed by the driver of a car traveling on a straight, level road with a speed of 50k.h?

    asked on September 26, 2013
  75. MATH

    f(x)=3x+2 g(x)=-2x+1 a) Write an equation for ( f+ g)(x) b) Determine (f+g)(6) c) Determine (fg)(6) d) Determine the domain of (f/g)(x)

    asked on July 19, 2013
  76. Calculus

    The motion of a spring that is subject to dampening (such as a car's shock absorber)is often modeled by the product of an exponential function and a sine or cosine function. Suppose the equation of motion for a point on such a spring is

    asked on June 18, 2013
  77. Chemistry

    two solutions are prepared using the same solute solution a: 0.27g of the solute disolves in 27.4g of t-butanol solution b: 0.23g of the solute disolves in 24.8g of cyclohexane which solution has the greatest freesing point change? show calculations and

    asked on February 18, 2013
  78. english, possessive nouns

    Directions: Wrie each sentence. Change the underlined phrase to show possession. The honesty of children is refreshing. The honesty of children is the underline part of the phrase.

    asked on October 23, 2012
  79. Algebra

    69% of the students at a school are involved in after-school activities. There are 598 students in the school. Which is the best estimate of the number of students in after school activities? A. 360 B. 380 C. 420 D. 450

    asked on January 2, 2012
  80. science

    When water is split into hydrogen and oxygen what happens- is it a change in matter

    asked on November 30, 2011
  81. math

    During a sale at the local department store, you buy three sweatshirts and two pairs of sweatpants for $85.50. Later you buy three more sweatshirts and four more pairs of sweatpants for $123.00 What is the sale price of each sweatshirt and each pair of

    asked on November 13, 2011
  82. Physics

    A hockey puck is sliding on frictionless ice. It slams against a wall and bounces back toward the player with the same speed that it had before hitting the wall. Does the velocity of the hockey puck change in this process?

    asked on September 15, 2011
  83. com 155

    • Write several sentences describing a recent interaction with a friend or family member about personal finance or credit cards. This interaction may be imagined or real. • Use at least five different pronouns in your sentences. • Identify all

    asked on January 30, 2011
  84. Psychology

    what is an example of "case study method" psychology?

    asked on November 26, 2010
  85. physics

    A man doing push-ups pauses in the position shown in the figure . His mass m = 80 kg. In push up position: From hands to waist = 40 cm From waist to feet = 95 cm height - heel of foot to ground = 30 cm Determine the normal force exerted by the floor on

    asked on November 3, 2010
  86. Mat 116

    Solve the system by graphing 8x-6=-18 6y-8x=18 divide 1 equation by 2 4x-3y=-9 divide 2 equation by -2 -4x-3y=-9 this makes both equation dependent slope intercept of two equation 4x-3y=-9 3y=4x+9 this makes this consistent. Just helping if I can.

    asked on April 11, 2010
  87. math

    the second angle of the a triangle is twice as large as the first angle. the measure of the third angle is 20 degrees less than the second. how large is each angle?

    asked on January 12, 2010
  88. chemistry

    How do it geth the equation for 50.0 grams of iron(II)carbonate react completely with hydrochloric acid how many grams of carbon dioxide gas may be produced?

    asked on November 6, 2009
  89. 8th grade

    essay on should students only have to take reading andmath to go to 9th grade agree or disagree?

    asked on April 13, 2009
  90. Grammar

    My teacher edited my story and I do not understand the abbreviations that she used. Does anyone know what she means by SV and SA.

    asked on October 9, 2008
  91. math

    A calcium ion has 20 protons and 18 electrons. Each proton has a +1 charge and each electron has a -1 charge. What is the charge of the calcium ion?

    asked on April 14, 2020
  92. math

    How long will it take a bird traveling at an average speed of 12 miles per hour to travel 202 miles while flying south for winter?

    asked on April 13, 2020
  93. math

    A cheetah traveling at 31 m/s chased its prey for 11 seconds. What distance did the cheetah travel during the chase?

    asked on April 13, 2020
  94. math

    Light travels at 186,000 miles per second. Light takes about 11⁄3 seconds to travel from the earth to the moon. Calculate the distance between the earth and the moon based on the speed of light.

    asked on April 13, 2020
  95. math

    You are having a lemonade stand and the ingredients to make lemonade comes out to about $.08 per cup. If you sell each cup for $.75 by what percentage did you markup a cup of lemonade?

    asked on February 3, 2020
  96. math


    asked on January 16, 2020
  97. math

    Shawntelle is solving a problem involving a triangular pyramid. You hear her say that "bee" is equal to 24 inches. How can you tell if she is talking about the base area B of the pyramid o about the base b of the triangle?

    asked on December 8, 2019
  98. math

    Steve picks 55 pounds of pears. He packs an equal amount of pears into 6 bags. He then has 4 pounds of pears left. What is the weight of pears in each bag?

    asked on November 12, 2019
  99. math

    write the ratio as a fraction in simplest form 5/4 to 2/3

    asked on November 4, 2019
  100. math

    the bottom floor of a parking garage has an elevation of -36 feet. The top floor is 124 feet higher. What is the elevation of the top floor.

    asked on October 17, 2019


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