# katy

Most popular questions and responses by katy
1. ## 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

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

3. ## 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.

4. ## 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.

5. ## 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

6. ## 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

7. ## 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

8. ## 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....

9. ## 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

10. ## 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?

11. ## 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?

12. ## IPC

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

13. ## 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

14. ## 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.

15. ## 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

16. ## Social studies

How has Aztec culture survived in Mexico? The Mexican military uses Aztec fighting tactics. Mexico still uses the Aztec calendar. The Mexican people have adopted many Nahuatl words into their language. My choice An Aztec Palace in Mexico city serves as the

17. ## Chemistry

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

18. ## PreCalc

The temperature T(t) varies sinusoidally on a certain day in December. The minimum temperature is 35 degrees Fahrenheit at midnight. The maximum temperature is 50 degrees Fahrenheit at noon. Let t be the number of hours since midnight (t=o at midnight).

19. ## 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

20. ## 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

21. ## math URGENT HELPPPP!

Regular triangular pyramid has the slant height k=12 cm and lateral area AL = 198 cm2. Find the length of the base edge.

22. ## math URGENT 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: Lateral area of the pyramid

23. ## 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

24. ## 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.

25. ## 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

26. ## Math help!

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

27. ## Chemistry

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

28. ## 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

29. ## 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.

30. ## algebra

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

31. ## Algebra

A movie theater manager wants to know how many adults and how many children pay admission to a particular movie. The theater charges \$10.00 for adult tickets and \$5.00 for child tickets. At a showing where 210 tickets were sold the theater collected

32. ## Algebra

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

33. ## 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?

34. ## 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?

35. ## 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. :)

36. ## 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

37. ## 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

38. ## 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

39. ## 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?

40. ## 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.

41. ## 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)

42. ## geometry

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

43. ## spanish

How do I translate my spanish Thank you for using the Jiskha Homework Help Forum. First of all you need to determine the vocabulary in the sentence. When you actually post some work here we can help you use the dictionary. The very BEST way is to look up

44. ## 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

45. ## 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 ;-;

46. ## math

Light travels at a speed of 186,282 miles per second. How could this number be expressed in scientific notation? 1)1,862.82 x 10 x10 x10 2)1.86282 x 10 x10 x 10 x10 x10 3)1.86282 x 10 x10 x10 x10 4)186.282 x -10 x-10 x -10

47. ## 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

48. ## 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.

49. ## 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

50. ## algebra

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

51. ## 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

52. ## 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.

53. ## 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

54. ## 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

55. ## 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?

56. ## 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

57. ## math

Julia spent 1/3 of her money. Then she lost 1/2 of the rest. She now has \$10 left. How much did she get for her birthday?

58. ## 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?

59. ## 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

60. ## 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

61. ## Biology

Fats are excellent energy storage molecules because a) they have a relatively high ratio of energy storing C—H bonds. b)they have a relatively high ratio of energy storing C=O bonds. c)they are hydrophobic and do not easily mix with water. d)they have a

62. ## science

A protostar has a high enough___to become a star. A. volume B. mass C. temperature D. brightness Is the answer B? Thanks in advance

63. ## 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?

64. ## 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)

65. ## Equation/Algebra

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

66. ## 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

67. ## Physics

A tennis ball is struck and departs from the racket horizontally with a speed of 29.1 m/s. The ball hits the court at a horizontal distance of 19.0 from the racket. How far above the court is the tennis ball when it leaves the racket?

68. ## 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 :).

69. ## Algebra

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

70. ## 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:

71. ## math

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.

72. ## english

Although the trend is shifting, careers in science and technology continue to attract predominately men.

73. ## Chemistry

I'm supposed to do this for an organic chemistry prelab. I've read my books and tried Googling everything possible, but I still don't know how to set this up. Please help! The solubility of a certain compound in ice-cold water is 0.18g in 100 mL. Its

74. ## S.S

WHAT IS THE MONEY CALLED IN SINGAPORE?

75. ## 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

76. ## Algebra

When Jonell checked the temperature in the morning, he saw that it was -4F. Late that afternoon, the temperature was 15F. Select the equation that represents this situation. -4+x=15;x=The number of degrees the temperature rose -4+x=15;x=The current

77. ## Chemistry

Calculate the ZnCO3 in a buffer solution with a pH of 9.83

78. ## 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

79. ## Math

An 8 meters bamboo pole is leaning against a coconut tree. The foot of the pole is 3 meters from the base of the tree. What angle does the pole make with the tree if the pole reaches up to the top of the tree? HELP PLEASE!

80. ## 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?

81. ## 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

82. ## 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 ? :)

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.

84. ## physics

The relative humidity is 55% on a day when the temperature is 30.0°C. Using the graph below, determine the number of moles of water vapor per cubic meter of air

85. ## Finance

Dave takes out a 30-year mortgage of 200000 dollars for his new house. Dave gets an interest rate of 16.8 percent compounded monthly. He agrees to make equal monthly payments, the first coming in one month. After making the 68th payment, Dave wants to buy

86. ## physics

A 50.0 kg gymast hangs vertically from a pair of parallel rings. If the ropes are supported so that they make an angle of 45 degrees with the ceiling, what is the tension in each rope?

87. ## Probability and Statistics

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

88. ## Fluid Mechanics

Oil (sp. gr.= 0.8) flows smoothly through the circular reducing section shown at 3 ft^3/s. If the entering and leaving velocity profiles are uniform, estimate the force which must be applied to the reducer to hold it in place. When Fluid is entering the

89. ## Algebra

Josh and Racquel sold cookies and brownies at the math club bake sale. The cookies cost \$0.47 each, and the brownies cost \$0.60 each. They sold a total of 603 items (cookies and brownies) and raised \$323.84 Write a system of equations and determine the

90. ## 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?

91. ## Geography

explain how Western Europe's physical geography affects its climate, settlement patterns, culture, and economy. Can anyone give me a website link to go to for this information?

Translate into an algebraic expressions:120 is increased by d % and increased by 25% . What is the result ?

93. ## Algebra

A department store is offering a coupon for 26% off for any purchases over \$100. How much would you spend for a \$100 purchase? You would spend \$____. Construct a formula a piecewise functiom for the actual cost, C, of the purchase as a function of the

94. ## Geometry

A circle has a center at (8,2). The point is (3,7) is on the circle. What is the area of the circle to the nearest tenth of a square unit? A. 22.2 B. 44.4 C. 157.1 D. 314.2 (I've been stuck on this question for a while) thanks!!

95. ## 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

97. ## Algebra

Tanisha is saving money to visit her cousin who lives in Mexico City. The table shows her the number of months since she started saving and the total in her savings account at the end of that month. a. Write an equation to model her savings. b. Tanisha

98. ## pre-calculus help:((((((((

how do u find period, all angles and name 8 angles for these???????? 1)cosxcos2x+sinxsin2x=sqrt(2)/2 2)5cosxsinx+2cosx=0

99. ## math

Light travels at a speed of 186,282 miles per second. How could this number be expressed in scientific notation? 1)1,862.82 x 10 x10 x10 2)1.86282 x 10 x10 x 10 x10 x10 3)1.86282 x 10 x10 x10 x10 4)186.282 x -10 x-10 x -10