# katy

Popular questions and responses by katy

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

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?

3. ## Math help!

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

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.

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

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?

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

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

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

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

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

12. ## math NEED HELP!

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

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

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

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?

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

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

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

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

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,

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

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.

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

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?

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?

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

27. ## geometry

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

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)

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.

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

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

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

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.

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.

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

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,

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

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?

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

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

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 .

42. ## astronomy

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

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?

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

45. ## pre-algebra

twenty more than three times a number is -4.

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:

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.

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

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

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.

51. ## Chemistry

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

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

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

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

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

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.

57. ## Probability and Satistics

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

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

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.

60. ## Chemistry

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

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.

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?

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

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?

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

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.

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....

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

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?

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?

71. ## math

what's a prime number?

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

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

74. ## S.S

WHAT IS THE MONEY CALLED IN SINGAPORE?

75. ## statistics

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

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

77. ## mathematics

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

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

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.

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

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.

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

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

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

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

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 ? :)

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

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)

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 :).

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 ;-;

91. ## Equation/Algebra

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

92. ## Algebra/equation

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

93. ## Algebra

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

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.

95. ## algebra

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

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

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.

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

99. ## algebra

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