katy

Popular questions and responses by katy
  1. math please help!!!

    The area of the base of the regular quadrilateral pyramid is 36 cm2 and the area of a lateral face is 48 cm2. Find: Surface area of the pyramid

    asked on May 5, 2017
  2. Probability and Statistics

    An oil prospector will drill a succession of holes in a given area to find a productive well. The probability that he is successful on a given trial is 0.2. a) What's the probability that that the third hole drilled is the first to yield a productive well?

    asked on September 29, 2013
  3. Math help!

    Simplify the expression (n^4)^8 A. n^(48) B. n^(32) C. n^(12) D. n^4

    asked on February 12, 2019
  4. posibility

    Three men and three women are waiting to be interviewed for jobs. If they are all selected in random order find the probability of each event. No man will be interviewed until at least two women have been interviewed.

    asked on November 16, 2012
  5. Probability and Statistics (Continuation)

    Assume 10% of the engines manufactured on an assembly line are defective. If engines are randomly selected one at a time and tested. What is the probability that the third nondefective engine will be found a)on the fifth trial? b) on or before the fifth

    asked on September 29, 2013
  6. IPC

    The latent heat of vaporization of water is 540 calories/gram. How many calories are required to completely vaporize 500 grams of water?

    asked on October 12, 2010
  7. Algebra

    A rain gutter is made from sheets of aluminum that are 11 inches wide. As shown in the figure the edges are turned up to form right angles. Determine the depth of the gutter that will allow a cross-sectional area of 10 in.². Show that there are two

    asked on September 11, 2017
  8. Science

    Which of the following statements is true? A. There is more water on Earth now than there was millions of years ago. B. There is less water on Earth now than there was millions of years ago. C. There is no way to tell how much water was on Earth millions

    asked on April 19, 2015
  9. Probability and Statistics

    The proportion of adults living in a small town who are college graduates is estimated to be p = 0.6. To test this hypothesis, a random sample of 15 adults is selected. If the number of college graduates in the sample is anywhere from 6 to 12, we shall not

    asked on November 30, 2013
  10. math

    Alottery has 100 tickerts which are placed in a barrel . Three tickets are drawn at random from the barrel to decide 3 prizes . If john has 3 tickets in the lottery , determine his probability of winning : A.first prize. B.first and second prize. C.all 3

    asked on September 24, 2012
  11. Algebra 2

    There are two spinners. Each spinner is numbered 1-4. Each spinner is spun once. Find the probability of spinning each of the following:2 on the first spinner and a 4 on the second spinner, both numbers the same, 3 on exactly one spinner, one number less

    asked on February 1, 2012
  12. math NEED HELP!

    How did the temperature change if it increased by 25 % and then decreased by 40% ?

    asked on August 3, 2017
  13. Math Helpppp

    The College Board, which are administered each year to many thousands of high school students, are scored so as to yield a mean of 550 and a standard deviation of 100. these scores are close to being normally distributed. what percentage of the scores can

    asked on February 23, 2013
  14. Geography

    How does Western Europe's physical geography affect its settlement patterns, economy, and culture? I've looked in the lesson and on google. But all of the websites that look like they might help are blocked. Can someone help, please? I don't need the

    asked on January 31, 2011
  15. physics

    an astronaut rotates at the end of a test machine whose arm has a length of 10.0m. if the acceleration she experiences must not exceed 5g (g=10m/s^2? what is the maximum number of revolutions per minute of the arm?

    asked on November 8, 2010
  16. Math,stat

    A smartphone company receives shipments of smartphones from three factories, labelled, 1, 2 and 3. Twenty-five percent of shipments come from factory 1 whose shipments contain 8% defective smartphones. Sixty-five percent of the shipments come from factory

    asked on April 19, 2020
  17. Math help

    In which type of symbiotic relationship is one organism helped while another organism is neither benefitted nor harmed? A: Mutualism B: Predation C: Commensalism D: Parasitism

    asked on February 20, 2019
  18. Math geometry

    Please help , I only need the second part of the question Betty picks 4 random marbles from a bag containing 3 white , 4 yellow and 5 blue marbles The probability that exactly 1 of the 4 marbles drawn is blue is (0.3535) . The probability that at least 1

    asked on May 2, 2017
  19. chemistry/engineering

    Wet sugar, containing one-fifth water by mass is conveyed through an evaporator in which 85.0% of the entering water is vaporized. Taking a Basis of 100 kg of feed to the evaporator A barrel of oil contains about 6 million Btu and about 1000 Btu is needed

    asked on September 22, 2015
  20. analytical chemistry

    Any help is greatly appreciated 5mL of a solution A (unknown concentration) was transferred into sic 25mL volumetric flask. The following volumes of a standard solution of A with with a concentration 75ppm were added to the flask: 0mL, 0.5mL, 1mL, 1.5mL,

    asked on May 8, 2015
  21. prod and oper management

    Hahn Manufacturing purchases a key component of one of its products from a local supplier. The current purchase price is $1,500 per unit. Efforts to standardize parts succeeded to the point that this same component can now be used in five different

    asked on September 6, 2014
  22. chemistry please help i cant figure this out

    What is the total mmHg pressure in of a gas mixture containing argon gas at 0.25atm , helium gas at 385mmHg , and nitrogen gas at 345torr. ? sorry i didn't relize i left them out.

    asked on September 6, 2012
  23. Algebra 2

    Find the values of the six trigonometric functions for ∠A in standard position determined by the point (63, 280). Enter your answers as fractions. sin A cos A tan A csc A sec A cot A

    asked on February 13, 2012
  24. earth

    if the radius of the earth's orbit around the sun is 93,000,000 miles, what is the speed of the earth in it's orbit in miles per hour?

    asked on September 10, 2011
  25. chemistry

    8.00g of NaOH are dissolved in water to make 4.00 of solution. What is the concentration of hydronium ions, , in this solution?

    asked on November 2, 2009
  26. Earth science

    1.which evidence would confirm that a given rock layer is newer than the layers around it? It has been crumpled and folded, while the other layers lie flat. Other layers have been deposited above it. It is horizontally-oriented. It cuts through all the

    asked on August 12, 2019
  27. geometry

    Jk=6r,kl=3r and jl = 27

    asked on October 7, 2013
  28. Fluid Mechanics

    Water flows into a cylindrical tank through pipe 1 at a rate of 25 ft/s and leaves through pipe 2 at 10 ft/s and through pipe 3 at 12 ft/s. Pipe 4 is an open air vent. Internal diameters of the pipes are: D1=3 in, D2= 2 in, D3=2.5 in, D4=2 in. Calculate a)

    asked on September 10, 2013
  29. Algebra 2

    There are two spinners. Each spinner is numbered 1-4. Each spinner is spun once. Find the probability of spinning each of the following: a 3 on both spinners, 1 on one spinner and a 3 on the other, both numbers less than 4, 3 on at least one spinner.

    asked on February 1, 2012
  30. Physics

    Having landed on a newly discovered planet, an astronaut sets up a simple pedulum of length 1.29 m and finds that it makes 567 oscillations in 1020 s. The amplitude of the oscillations is very small compared to the pendulum's length. What is the

    asked on January 7, 2010
  31. Geography

    Drag and drop the descriptions of events to match conditions in each country following world war II china japan korea Taiwan 1. Communist anti-communist forces backed by foreign nations went to war here, dividing the country into North and south **Taiwan

    asked on April 7, 2020
  32. PreCalc

    As you ride a bicycle, the distance between your foot and the pavement varies sinusoidally with the horizontal distance the bicycle has gone. Suppose that you start with your right foot somewhere between a high point and a low point, and push down. When

    asked on April 27, 2016
  33. geometry

    The endpoints of the diameter of a circle are at (1,2) and (7,-6). What is the circumference of the circle, to the nearest tenth of a unit.

    asked on September 15, 2015
  34. geometry

    What is the perimeter of rectangle WXYZ, with vertices W(-3,7), X(-5,4), Y(1,0), and Z(3,3) to the nearest unit.

    asked on September 15, 2015
  35. geometry

    Jenny is building a rectangular garden around a tree in her yard. The southwest corner of the garden will be 2 feet south and 3 feet west of the tree. The northeast corner of the garden will be 1 foot north and 4 feet east of the tree. If jenny paves a

    asked on September 14, 2015
  36. analytical chemistry

    DrBob222, it is me again. Continue the question 5mL of a solution A (unknown concentration) was transferred into sic 25mL volumetric flask. The following volumes of a standard solution of A with with a concentration 75ppm were added to the flask: 0mL,

    asked on May 10, 2015
  37. chemistry

    How would you make 1L of a buffer of pH=11 starting with 15g of base, C5H11N:. At you disposal are 1M HCl and 1M NaOH, pH meter, balance, distilled water and glassware. Try to be quantitative in expressing amounts of material that you will use. Given for

    asked on March 24, 2015
  38. chemistry

    Flask A contains 100 milliliters of a solution with a pH of 5. After you add 100 milliliters of a solution from Flask B, the pH rises to 7. What was the pH of the solution in Flask B?

    asked on September 5, 2014
  39. physics

    A police car is traveling at a velocity of 19.0 m/s due north, when a car zooms by at a constant velocity of 49.0 m/s due north. After a reaction time 0.600 s the policeman begins to pursue the speeder with an acceleration of 6.00 m/s^2. Including the

    asked on September 15, 2013
  40. chemistry please help

    What is the total pressure in of a gas mixture containing argon gas at 0.25 , helium gas at 385 , and nitrogen gas at 345

    asked on September 6, 2012
  41. chem.

    What is the total pressure in of a gas mixture containing argon gas at 0.25 , helium gas at 385 , and nitrogen gas at 345 .

    asked on September 6, 2012
  42. astronomy

    the radius of earth is 4000 miles, how far would you travel in going around the equator?

    asked on September 10, 2011
  43. geometry

    An Equilateral triangle (ABC) is inscribed inside a circle. The side lengths of the triangle are 8 cm. What is the radius of the circle?

    asked on March 29, 2011
  44. World Geography

    Which statement describes negative population growth? A) Fewer people are born than die during a given period. B) Fewer people die than are born during a given period. C) More people are born than die during a given period. D) More people die than are born

    asked on January 25, 2011
  45. pre-algebra

    twenty more than three times a number is -4.

    asked on November 2, 2009
  46. Algebra

    Write a system of inequalities to describe the shaded area of the graph. This is the question on my homework today that i just don't get. My teacher said to use point slope form. y=y1+m(x-x1) The coordianate points of the triangular area are line 1:

    asked on February 12, 2009
  47. Chemistry

    The electron configuration for Europium? I think it's 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f7 Is that right? I'm not sure if I did it right with the f block.

    asked on March 10, 2008
  48. HELP PLEASE

    the wind blowing on a vertical surface varies jointly as the area of the surface and the square of the velocity. if a wind of 40 mph exerts a force of 50 pounds on a surface of 1/2 square foot , how much force will a wind of 80 mph place on a surface of 2

    asked on October 1, 2007
  49. science

    At which type of plate boundary would a string of small volcanic islands most likely form? convergent ocean-land boundary**** convergent ocean-ocean boundary transverse boundary divergent ocean-ocean boundary

    asked on September 15, 2019
  50. Algebra

    Explain patterns in the placement of the decimal point when multiplying 5 by 10^2, 10 ^1 and 10^0. Please explain i'm not very good with math.

    asked on October 3, 2018
  51. Chemistry

    Calculate the solubility of ZnCO3 in a buffer solution with a pH of 9.83 and Ksp of 1.2x10^-10

    asked on April 25, 2017
  52. math asap

    Solve the proportion using cross products. 8/20 = k/110 (A)99*^* (B)122 (C)3.3 (D)2.9 Am I correct? please asap

    asked on November 16, 2016
  53. Math

    Sara and Jenny can both do flips in the air. The ratio of the number of flips Sara can do to the number of flips Jenny can do is 3:8. Jenny can do 120 more flips than Sara. If Sara increases the number of her flips by 3 and Jenny decreases the number of

    asked on November 7, 2015
  54. Analytical Chemistry

    5mL of a solution A (unknown concentration) was transferred into sic 25mL volumetric flask. The following volumes of a standard solution of A with with a concentration 75ppm were added to the flask: 0mL, 0.5mL, 1mL, 1.5mL, 2mL, and 2.5L. The excitation

    asked on May 8, 2015
  55. Social studies

    How could a poll tax or a literacy test has been used to prevent someone from voting? The Civil war Amendments Before. After

    asked on March 23, 2015
  56. Physics

    A car traveling 85km/h slows down at a constant 0.52m/s2 just by "letting up on the gas." Calculate the distance the car coasts before it stops.

    asked on February 8, 2015
  57. Probability and Satistics

    Random Variables X and Y follow a joint distribution: f(x,y)=(6-x-y)/8 if 0

    asked on November 2, 2013
  58. Algebra

    Solve the system of equations by substitution. Your answer should be given as an ordered pair like this (x, y). Round your answers to the nearest tenth. y=-2+7x 10x-7y=209

    asked on March 25, 2012
  59. math

    Give each letter of the alphabet a money value: A= 1 penny, B= 2 penny, C= 3 penny,and so on.Find words worth 1/5 dollar, 9/10 dollar, 1 1/20 dollars, and 1 1/2 dollars.

    asked on January 16, 2012
  60. Chemistry

    What is the name of the compound PBr5 using the Stock system?

    asked on December 14, 2011
  61. Calculus

    If a rock is thrown upward on the planet Mars with a velocity of 14 m/s, its height in meters t seconds later is given by y = 14t − 1.86t^2. Estimate the instantaneous velocity when t = 1.

    asked on October 8, 2011
  62. physics

    an astronaut rotates at the end of a tesr machine whose arm has a length of 10.0m. if the acceleration she experiences must not exceed 5g (g=10m/s^2? what is the maximum number of revolutions per minute of the arm?

    asked on November 8, 2010
  63. Geography/History

    Multiple select. The dissolution of the Union of Soviet Socialist Republics _____. 1) had no effect on the United States 2) affected nations throughout the world 3) reduced the number of Communist nations in the world 4) increased the number of Communist

    asked on October 15, 2010
  64. Geography/History

    Incidents of Basque violence are caused by their desire for _____. 1) educational opportunities 2) improved health care 3) increased wages 4) independence I think it is 4. I just want to know if I am right. help?

    asked on October 15, 2010
  65. IPC

    The specific heat of gold is 0.031 calories/gram°C and the specific heat of silver is 0.057 calories/gram°C. If equal amounts of each metal are exposed to equal heating, which will heat up faster? The answers are: 1) The silver will heat up almost twice

    asked on October 13, 2010
  66. health

    Sally sues for malpractice, claiming she didn't know that the operation could have (and, in this case, did have) negative consequences. Your office has a copy of an informed consent form signed by Sally. Explain how this affects the case.

    asked on July 27, 2010
  67. Physics

    A sample of helium behaves as an ideal gas as it is heated at constant pressure from 273 K to 373 K. If 15.0 J of work is done by the gas during this process, what is the mass of helium present? I am not sure what equations to use for this problem....

    asked on May 4, 2010
  68. Physics

    Having landed on a newly discovered planet, an astronaut sets up a simple pedulum of length 1.29 m and finds that it makes 567 oscillations in 1020 s. The amplitude of the oscillations is very small compared to the pendulum's length. What is the

    asked on January 7, 2010
  69. chemistry

    sorry i forgot some of the units in the initial posting 8.00g of NaOH are dissolved in water to make 4.00L of solution. What is the concentration of hydronium ions, , in this solution?

    asked on November 2, 2009
  70. chemistry

    8.00 of are dissolved in water to make 4.00 of solution. What is the concentration of hydronium ions, , in this solution?

    asked on November 2, 2009
  71. math

    what's a prime number?

    asked on October 17, 2009
  72. Algebra I - Answer check

    2. a) 7^12/7^4 = 7^8 b)x^11/x^5 = x^6 c)12x^5/3x^2 = 4x^3 d)7x^6y^3/14x^3y = .5x^3y^2 5. a) (2x)^3(3x^2)^4 = 648x^11 b)(5x)^7/(5x)^4 = 25x^2 c)(2x)^5/-8x^3 = -4x^2 d)(4x^2y^5)(-3xy^3)^3 = -12xy^4 6. How long does it take light to travel from the Sun to

    asked on March 9, 2009
  73. Algebra I

    Match expressions from this list that are equivalent but written in different forms. There can be multiple matches. I know that there is a group of 3, and a group of 2, matching expressions. Here are the expression-I need help figuring out how to go about

    asked on March 3, 2009
  74. S.S

    WHAT IS THE MONEY CALLED IN SINGAPORE?

    asked on February 9, 2009
  75. statistics

    Using the z-table (Table E) find the critical value (or values) for a = .018 left tailed test.

    asked on April 29, 2008
  76. Geometry

    Show the conhecture is false by finding a counterexample... 1. The differnece of the absolute value of two numbers is positive meaning /a/ - /b/ > 0 I do not get that.... =/ HELP. If absolute value of a is greater than the absolute value of b, then the

    asked on August 14, 2007
  77. mathematics

    5/8(16e + 24f - 56g) =

    asked on May 1, 2020
  78. Algebra

    Christion and Jessica want to build a pool in their backyard. However they also have dogs so they do not want the pool to take up all of the backyard. Christion is wondering how much room the dogs will have to run while jessica is concerned about the size

    asked on March 24, 2020
  79. Math

    The table defines a quadratic function What is the average rate of change between x=-1 and x=1 x|y -1|5 0|1 1|-1 3|1 Please explain :/ by the way it already says the answer is -3 i just don't know how.

    asked on February 26, 2020
  80. Biology

    Please check my answers ! Which effect of temperature rise causes a feedback resulting in a rise in global temperatures? more water vapor in the atmosphere**** less severe storms less water vapor in the atmosphere more severe storms How does climate change

    asked on February 24, 2020
  81. Biology

    I'm unsure of what a ℉ 31/45 is of a Temperature Range. I'm not sure whether it means hot or cold. But i think it means cold.

    asked on February 19, 2020
  82. Algebra

    Amazon charges a flat rate of $129 (yearly) for Amazon Prime and $7.99 for each HD movie rental. Youtube Red charges a flat rate of $144 (yearly) and $4.99 for each movie rental. Write an equation to represent Youtube's charges. Explain how you got that

    asked on December 17, 2019
  83. math

    1. Identify the graph(s) whose line may have the given slope. Then, describe your strategy for matching the graphs to the given slopes. a.1/4 b.0 c.5/4 d.-3

    asked on October 14, 2019
  84. Algebra

    The first step to solve for y in y/3= 6 + x is A) to subtract x from both sides of the equation. B) to subtract y/3 from both sides of the equation. C) to divide each term on both sides of the equation by 3. ******* D) to multiply each term on both sides

    asked on September 8, 2019
  85. biology

    How can earth's layers be defined? (two answers) by their amounts of land area by their physical properties(this) by their asthenospheres by their chemical compositions(this) by their proximities to the core the chemical one is right but im not sure about

    asked on August 12, 2019
  86. algebra

    4^5/4^5 1* 4 5 0 4^7/4^9 -16 1/16* 1/8 8 If they are wrong could you please explain ? :)

    asked on May 22, 2019
  87. Algebra

    An office manager reported that he spent $350 on gifts for employees. He said that $240 was spent on clothing with each man receiving a $20 T-shirt and each woman receiving a $40 sweatshirt. He said that $110 was spent on desk accessories with each man

    asked on May 16, 2019
  88. Algebra

    Find the solution to the system of equations by using either graphing or substitution. y+x=3 y-2x=18 (-4.5,7.5) (-5,8) (-6,9) (-7.5,10.5)

    asked on May 16, 2019
  89. Algebra

    Which table represents a function? x|3|-1|1|-1 y|0|4|2|-2 ________ x|0|1|0|2 y|2|3|0|3 _______ x|-2|2|4|-2 y|5|1|5|5 _______ x|5|4|5|1 y|1|5|4|5 I am not sure how to know. So please explain so next time I can know how :).

    asked on April 2, 2019
  90. Math help!

    Simplify: (3cd^4)(-2c^2)(5cd^3) A: 6c^4d^7 B: -30c^4d^7 C: 6c^2d^7 D: -30c^2d^7 I am completely clueless on what the answer would be, help appreciated ;-;

    asked on February 21, 2019
  91. Equation/Algebra

    -2x+5(x+3)=-9 Can someone help me solve this step by step?

    asked on February 19, 2019
  92. Algebra/equation

    6n-4+5n=73 This is my last one thank u. :)

    asked on January 15, 2019
  93. Algebra

    7+8x=-33 How can I solve this? with steps please.

    asked on January 15, 2019
  94. Algebra

    -6q+5.8=23.8 q=3 q=-3*** q=-1.83 q=4.93 This is my last question, but I just want to know how to solve it with steps for further knowing.

    asked on January 7, 2019
  95. algebra

    7x/8=21 a. 24**** b. 18.375 c. 1.857 d. 19 Im not very sure how to solve this.

    asked on January 7, 2019
  96. Algebra

    1.)which of the following is an irrational number? 6.444..... 21/square root(16) 5π/π **** btw these are pi signs π

    asked on January 3, 2019
  97. Algebra

    1.)Which of the following statements is true? Positive numbers are always rational numbers. Negative numbers are always irrational numbers. Negative numbers are sometimes rational numbers.********* Negative numbers are always integers.

    asked on January 3, 2019
  98. Algebra

    1.) Which of the following numbers could be added to 3/16 to make a sum greater than 1/2? 5/16 10/32 2/6 1/4 Which of the following pairs of numbers provides the best estimate of (square root of 45)? (square root of 25) and (square root of 36 (square root

    asked on January 3, 2019
  99. algebra

    Is 84/105 and 128/160 proportional? please explain im so stuck.

    asked on November 7, 2018
  100. algebra

    joey and helen are standing in opposite corners of a rectangular field. if the field has dimensions 120ft by 209 ft, how far apart are they? Please help me solve this and lead me through the problem , thank you. :)

    asked on November 5, 2018

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