Pam

Popular questions and responses by Pam
1. math

A 10 foot ladder is placed against a vertical wall of a building, with the bottom of the ladder standing on level ground 8 feet from the base of the building. How high up the wall does the ladder reach.

2. Physics

A butterfly at eye level is 20 cm in front of a plane mirror. You are behind the butterfly, 50 cm from the mirror. What is the distance between your eye and the image of the butterfly in the mirror? Explain your reasoning. We also have to make a sketch. I

3. Math

A model rocket is launched with an initial velocity of 164ft/sec. It's height h, in feet, after t seconds is given by the formula h=164t-16t^2. After how many seconds will the rocket first reach a height of 400ft?

4. Algebra

The accompanying bar graph shows the milk fat percentages in three dairy products. A=whole milk @4%. B= milk for cream cheese @8%, and C= cream @30%. How many pounds each of whole milk and cream should be mixed to form 200 lb of milk for cream cheese? How

5. Physics

If you hold a pocket mirror almost at arm's length from your face,and note how much of your face you can see; to see more of your face, should you hold the mirror closer or farther away , or would you have to get a larger mirror? I tried this, but I could

6. Math

Evaluate the expression. P(9,4) A.1512 B.240 c.3024 D.15,120 (9) (4) the 4 is underneath the 9 in the parathesis with it A. 15,120 B.126 C.1512 D.240

7. math

a 13 ft ladder is placed against a vertical wall of a building, with the bottom of the ladder stand on level ground 5ft from the base of the building. how high up the wall does the ladder reach.

8. Math

A patio was to be laid in a design with one tile in the first row,two tiles in the second row,three tiles in the third row, and so on. Mr Tong had 60 tiles to use. How tiles should be placed in the bottom row to use the most tiles?

9. Algebra

A scientist wants to research the potential spread of germs by contact. She knows that the number of possible handshakes within a group of n people is given by the equation N=1/2(n^2-n). Everyone at a party shook hands. There were 253 handshakes in all.

10. Math

The first term is 23, and the common difference is 4 ; n= 5

11. Math

A train leaves a station and travels north at a speed of 45mph. Four hours later, a second train leaves on a parallel track and travels north at 105 mph. How far from the station will they meet? The trains will meet ________ miles away from the station

12. Chemistry

1) Determine the equilibrium constant, Keq, at 25°C for the reaction 2Br– (aq) + I2(s) ⇌ Br2(l) + 2I– (aq) My wrong answer: 7.6e-10 2) Aluminum metal is formed by the electrolysis of Al2O3 in molten cryolite. How many minutes are required to form

13. Algebra

In 1991, the life expectancy of males in a certain country was 67.2 years. In 1995, it was 71.1 years. Let E represent the life expectancy in year t and let t represent the number of years since 1990. The linear function E(t) that fits the data is E(t) =?t

14. chemistry

if .500 mol of copper combines with .250 mol of sulfur what is the empirical formula of copper sulfide?

15. Physical Science

How much heat is necessary to change 20 g of ice at 0 degrees C into water at 0 degrees C?

16. Enlish-College

Why could one say that "Shall I Compare Thee to a Summer's Day"? presents contrast rather than comparison? The poem I am referencing in quotations is by Shakespeare.

17. Math

A basketball player scored 18 times during one game. He scored a total of 35 points, two for each two point shot and one. For each free throw. How many two point shots did he make? How many free throws?

18. Chemistry

A solution of ammonia and water contains 2.90×1025 water molecules and 9.00×1024 ammonia molecules. How many total hydrogen atoms are in this solution? any help would be great.

19. physics

An iron wire has a cross-sectional area equal to 1.20 10-5 m2. Carry out the following steps to determine the drift speed of the conduction electrons in the wire if it carries a current of 34.0 A. (a) How many kilograms are there in 1.00 mole of iron? 1

20. Anatomy

Why is feedback and homeostasis so important? How do they connecf? What would be the consequence if the homeostasis was not stable.

21. math

a 20-foot ladder is placed against a vertical wall of a building, with the bottom of the ladder standing on level ground 16ft from the base of the building. how high up the wall does the ladder reach?

22. Math

A lamppost is 20 feet tall and a man is standing 30 feet away casting a 10 foot shadow. How tall is the man?

23. Math

In how many ways can 4 people be chosen and arranged in a straight line, if there are 5 people from whom to choose? A shirt company has 3 designs that can be made with short or long sleeves. There are 5 color patterns available. How many different types of

24. calculus

find volumes of solids generated by revolving the regions bounded by the graphs of the equations about the given lines. y=square root of x y=0 x=3

25. Algebra

Two angles are complementary. Their difference is 50^*. Find the angles.

26. Math

The number of tickets sold each day for an upcoming performance is given by N(x)=-0.3x^2+9x+15, where x is the number of days since the concert was first announced. When will daily ticket sales peak and how many tickets will be sold that day?

27. Math

An architect has allocated a rectangular space of 264ft^2 for a square dining room and a 10ft wide kitchen. What is both the width of the square dining room and the length of entire space.

28. Algebra

Could someone help me with finding an equation of the line containing the given pair of points (3,2) and (9,7)

29. Math

Lisa attended 72% of 32 school events. How many schol events did Lisa not attend? my answer is 8

30. English 1

Revise the following paragraph, improving it without changing its overall meaning. Pay particular attention to any potential sentence fragments. Cooking is not as easy as it looks. For example, the terminology. Selecting the freshest ingredients for

31. Math

The leaning tower of Pisa is 55.9 m tall and leans 5.5 degrees from the vertical. If its shadow is 90 m long, what is the distance from the top of the tower to the top of the edge of its shadow, assuming the ground around the tower is level?

32. Math

8 students share 5 square pieces of cake equally. Draw to show how much each person gets.

33. TRIG

5. A wheel 5.00 ft in diameter rolls up a 15.0° incline. How far above the base of the incline is the top of the wheel after the wheel has completed one revolution? A. 4.07 ft B. 13.1 ft C. 8.13 ft D. 9.07 ft

34. math

A 4 ft spring measures 8 ft long after a mass weighing 8 pounds is attached to it. the medium through which the mass moves offers a damping force numerically equal to sqrt.2 times the instantaneous velocity. Find the equation of motion if the mass is

"Tommy has 16 toy trucks. How many different arrays can he make with all the trucks?What are the arrays?"

36. chemistry

A 1.20-L container contains 1.10 g of unknown gas at STP.What is the molecular weight of the unknown gas?

37. SCIENCE

The smallest of the earth's oceans is the _______ Ocean a) Pacific b) arctic c) indian d) atlantic e)lagon B

38. Grammar

Which sentence does the verb have a direct object? She is insecure. or They won the game. I cannot tell which is correct.

39. English-College

I guess I don't understand the question(why the quote presents contrast rather than comparison) my book is asking. I'm new to this poetry thing, please help!

40. Math

If 4X + Y =H, Then X is equal to? 4X + Y =H Move Y to other side by subtracting Y from both sides. 4X + Y - Y = H - Y Combine terms. 4X = H - Y Now divide both sides by 4 to get 1X. 4X/4 = (H - Y)/4 X = (H-Y)4 or (1/4)(H-Y)

41. science

A pipe of diameter 80mm is fitted with a branch section into which fit two pipes of equal diameter. If it is desired that the velocity remain constant throughout, determine the required diameter of each of the branch pipes.

42. Math

One day 3/8 of the students in Jack's class ate toast for breakfast. Another 1/8 of the students ate oatmeal. Jack added the fractions and found the sum was 7/8. Which statement best describes the sum 7/8? A) It is reasonable because 1/2 + 0 = 1/2. B) It

43. Math

Pen has 1/2 cup and 1/8 cup measuring cups. What are two ways he could measure out 1 3/4 cups of flour? Plz help thanks!

44. Chemistry

How do I prepare 1liter of a 93.1% w/w solution of sulfuric acid using 98% sulfuric acid and water?

45. Math

On what day in the year 1943 was the year 300 000 minutes old?

46. Chemistry

Nitrogen dioxide reacts with carbon monoxide to produce nitrogen monoxide and carbon dioxide in the reaction, . The first step in the reaction is proposed to be two NO2 molecules colliding to form NO3 and NO. The NO3 intermediate then reacts with CO to

47. Math

Write the opposite of 0 Celsius and 32f temperature as integer. Plz help

48. Math

The number of tickets sold each day for an upcoming performance of Handel,s Messiah is given by N(x)=-0.4^2+8.8x+10, where x is the number of days since the concert was first announced. When will daily ticket sales peak and how many tickets will be sold

49. math

As a fundraiser a school club is sellin posters. The printer charges a \$24 set up fee plus \$o.20 for each poster. Then the cost y in dollars to print is given by the linear equation y=0.20x+24 A. The printing of 50 posters cost? The printing cost of 100

50. math

north avenue is 36ft wide when it ends at main st. a 45 foot long diagonal crosswal allows pedestrians to cross main st to or from either corner of north ave. determine the width of main st.

51. math

a triangular traffic island has a base half as long as its height. the island has an area of 121m^2. find the base and the height.

52. statistics - conditional probability

Event A has probability 0.9 of occurring. Event B has 0.2 chance of occurring if, and only if, event A has occurred. What is the overall probability that event B will occur? I'm so confused. This seems so simple, I'm not sure why I can't reason through it.

53. Math

What is an equation of the line having the given slope and containing the given point M = -8,(4,6)

54. Chemistry Honors

Hydrogen burns to give water. If 200cm3 of H2 reacts with 150cm3 of O2 what volume of water vapor is produced

55. math

To determine the number of trout in a lake, conservationist catches 161 trout, tags them and throuws them back into the lake. Later, 39 trout are caught: 13 of them are tagged. How many trout would the conservationist expect to be in the lake?

56. chemistry

calculating the molarity of acetic acid in a vinegar sample given that 5.00 of vinegar required 43.50 mL of 0.1050 M NaOH to just reach the methyl red endpoint.

57. Statistics

4. The data below are from an independent-measures experiment comparing three different treatment conditions. Treat. 1 Treat 2 Treat 3 0 1 4 0 4 3 G=24 0 1 6 2 1 3 Σ X² = 92 T=2 T=6 T=16 SS=3 SS=9 SS=6 Use an analysis of variance with α of .05 to

58. science

A pyramid of numbers demonstrates that a community has a) producers who depend on consumers for food b) more producers than primary consumers c) the same number of organisms at each level d) more consumers than producers e) no loss of usable energy B

59. science

The following statement is a vaild scientific theory. If Watson and Crick had not discovered the structure of DNA, bio - technology would be 20 years behind where it is today. TRUE FALSE true

61. Run-on Sentences

Is this a run-on sentence? "I thought about what he'd said soon I realized he was right." I think it is. Just want to be sure.

62. Language Arts

Could you give me examples of action verbs, linking verbs and helping verbs?

63. calculus

Please help, my live tutor and I could spent 2 hours trying to solve these two: find an equation for tangent line y=-1-8^2@ (-4,-129) find the derivative of the function:----we both kept getting the same answer, but Mathlab kept saying that it was wrong:

64. trigonometry

find soultuion in degree, use exact value 1. cos2xcosx+sin2xsinx=-1/2

65. Biology

How are sperm cells specialized to carry out their functions in penetration and fertilization of an egg? Explain with the help of a diagram. could anyone please help me with this question? any sources cited would be appreciated, especially sources for

66. Math

If f (x)= x^2-1 and f(2a)=35, then what could be the value of a ?

67. Anatomy

What is the the muscles nervous systems ? Muscles are: Smooth muscle Skeletal muscle Cardiac muscle

68. English

3 quotes for fiction signposts. For the book called Bird by bird by anne lamott

69. Chemistry

I have asked this question before but I was not clear enough. I want to prepare a 37% w/w solution (in water)of sulfuric acid from 96% sulfuric acid. I need around 500ml, I know it won't be exactly that, I want to know how to use the conversion using

70. algebra

solve for x Inx-In5=0 x=5 n=0

71. statistics

1. What two aspects of data determine which measure of central tendency to use? 2. Why is it best to use the mean with a normal distribution ?

72. algebra

In mixing a weed killing chemical a 40% solution of the chemical is mixed with an 85% solution to get 20 L of a 60% solution. How much of each solution is needed?

73. Math

If a spherical tanl 4m in diameter can be fillef with a liquid for \$900, find the cost to fill a tank 12m in diameter. The cost to fill the 12m tank is \$__.

74. math

At which grade level is it most appropriate for children to group by more than one attribute?

75. Algebra

The sum of two numbers is 9. Four times the larger number plus three times the smaller number is 48. Find the numbers. Thank you

76. Algebra

\$5400 is invested, part of it at 10%, and part of it at6%. For a certain year, the total yield is \$444.00. How much was invested at each rate?

77. Algebra

\$6300 is invested, part of it at 11% and part of it at 8%. For a certain year, the total yield is \$597.00. How much was invested at each rate?

78. Algebra

\$6300 is invested, part of it at 11% and part of it at 8%. For a certain year, the total yield is \$597.00. How much was invested at each rate?

79. Algebra

The formula r =2 sqrt.5L can be used to approximate the speed r, in miles per hour, of a car that has left skid marks of length L, in feet. How far will a car skid at 60 mph?

80. Math

An architect has allocated a rectangular space of 589ft^2 for a square dining room and a 12ft wide kitchen. Find both the width of the square dining room and the length of the entire rectangular space. The width of the square dining room is _____ft The

81. algebra

explain to me why the first coordinate of the y intercept is always 0 please.

82. math

explain to me why the slant of a line with slope 5/3 is steeper than the slant of a line with slope 4/3

83. Algebra

Find a slope if it exists, please. 9x-y=9

84. Math

Find the slope, if it exists, of the following line. X=2/15

85. Math

Find an equation of the line having the given slope and containing the point. M=-8,(1,8)

86. Math

What's an equation containing the given pair of points. Express in the form of x=a, y=b, or y=mx+b. (-5,-5) and (3,3)

87. Math

An architect has allocated a rectangular space of 666ft^2 for a square dining room and a 19ft wide kitchen. Find the width of the square dining room and the length of the entire rectangular space.

88. Math

A 26ft ladder is placed against a vertical wall of a building, with the bottom of the ladder standing on level ground 24ft from the base of the building. How high up the wall does the ladder reach?

89. Math

Find the vertex of the parabola. Sketch the graph. Y=x^2+2x-3

90. Math

The base of a triangle is 8cm greater than the height . The area is 24cm^2. The height is what and the base is what?

91. statistics - conditional probability

Event A has probability 0.9 of occurring. Event B has 0.2 chance of occurring if, and only if, event A has occurred. What is the overall probability that event B will occur? I'm so confused. This seems so simple, I'm not sure why I can't reason through it.

92. Science/Biology

Pick the correct answer to the following question. Write a brief statement explaining why each choice of answers is correct or incorrect. In diabetes mellitus, because of insufficient insulin production, glucose cannot enter cells. instead it accumulates

Pick the correct answer to the following question. Write a brief statement explaining why each choice of answers is correct or incorrect. In diabetes mellitus, because of insufficient insulin production, glucose cannot enter cells. instead it accumulates

94. physics

A man is 3/8th of the way across a railroad bridge when he hears a train coming. He knows that this passenger train cruises along at 60 MPH in this area. It turns out that he can run to either end of the bridge and jump off just ahead of the train.

95. math

a sameple of 137 firecrackers contained 6 duds. how many duds would you expect in a sample of 2466 firecrackers?

96. Statistics

4. The data below are from an independent-measures experiment comparing three different treatment conditions. Treat. 1 Treat 2 Treat 3 0 1 4 0 4 3 G=24 0 1 6 2 1 3 Ó X² = 92 T=2 T=6 T=16 SS=3 SS=9 SS=6 Use an analysis of variance with á of .05 to

97. graphs in math

C varies inversely as J. If C = 7 when J = 0.7, determine C when J = 12

98. math

substract; than reduce answer to lowest terms 5/22- 1/41