1. math

One pump can empty a pool in 5 days, whereas a second pump can empty the pool in 7 days. How long will it take the two pumps, working together, to empty the pool?

2. Physics Help NOW!

A 64 kg woman stands on a very light, rigid board that rests on a bathroom scale at each end. She is 1.5m in on the 2m board. What is the reading on each of the scales in kg? Homework is almost due and I cant figure this out!!!!

3. Physics

A baseball is hit with a speed of 27.0 m/s at an angle of 42.0 deg. It lands on the flat roof of a 10.0 m-tall nearby building. If the ball was hit when it was 1.0 m above the ground, what horizontal distance does it travel before it lands on the building?

4. statistics

Consider a binomial experiment with 20 trials and probability 0.45 on a single trial. Use the normal distribution to find the probability of exactly 10 successes. Round your answer to the thousandths place.

A 64 kg woman stands on a very light, rigid board that rests on a bathroom scale at each end. She is 1.5m in on the 2m board. What is the reading on each of the scales in kg? Homework is almost due and I cant figure this out!!!!

6. statistics

In a preliminary study, the sample standard deviation for the duration of a particular back pain suffered by patients was 18.0 months. How large a random sample is needed to construct a 90% confidence interval so that an estimate can be made within 2

7. physics

A ceiling fan has four blades, each with a mass of 0.40 kg and a length of 65 cm. Model each blade as a rod connected to the fan axle at one end. When the fan is turned on, it takes 4.45 s for the fan to reach its final angular speed of 2.3 rev/s. What

8. Math

A team has been working to convert diesel-powered cars to run just as efficiently on used cooking oil! They want to compare the mileage and speed of their prototype with that of the diesel-powered car. The prototype is 100 meters south of an intersection,

9. physics

WHEN TWO BODIES A AND B INTERACT WITH EACH OTHER,A EXERTS a FORCE OF 10 N ON B,TOWARDS EAST.WHAT IS THE FORCE EXERTED BY B ON A?

10. math

A pile of 108 identical books has a mass of 30 kg. Find (a)the mass of 150 books and (b)the number of books that has a mass of 20 kg.

11. algebra

the diagonal of a rectangular room is 13ft long. one wall measures 7ft longer than the adjacent wall. what are the dimensions of the room

12. accounting

On January 1, 2006, Powell Company purchased a building and machinery that have the following useful lives, salvage value, and costs. Building, 25-year estimated useful life, \$4,000,000 cost, \$400,000 salvage value Machinery, 10-year estimated useful life,

13. Math

If you deposit \$900 semiannually in a bank which pays 6% interest compounded semiannually and make no more deposits after 7 years, what is the balance in the account 8 yrs. later from the last deposit?

14. Science

Hydrochloric acid and sodium hydroxide are mixed together to form salt and water. During the reaction, the temperature of the solution increases. Which of these best explains why this is considered to be a chemical change? No energy was destroyed. Heat was

15. Physics

You set out to design a car that uses the energy stored in a flywheel consisting of a uniform 103-kg cylinder of radius R that has a maximum angular speed of 450 rev/s. The flywheel must deliver an average of 1.70 MJ of energy for each kilometer of

16. chemistry

a compound x has a solubility of 79g/100 g h20. when 24 g of x are added to 68 g of water the resulting mixture is homogeneous or heterogenous

Evaluate each mission statement based on the following: • Beliefs • Mission • Vision • Culture • Goals • Products Show how each one of the mission statements does or does not meet the requirements of a good mission statement. I am not quite

18. English

I have to write a speech on a pet peeve. I chose aggressive driving. Here is my introduction for the outline. Think? Aggressive Driving Introduction •How many of you have turned on the news or opened a newspaper to find that another human being was

19. english

Can you please tell me if the sentence in quotation marks is the topic sentence? I read paragraph one and paragraph three, I believe that paragraph one was a very effective paragraph. "It touches a few very interesting points about why someone should

20. math

River Current A boat can travel 36 miles upstream in the same time that it can travel 54 miles downstream. If the speed of the current is 3 miles per hour, find the speed of the boat without a current.

21. intermediate algebra

Express in terms of i. 2 divided by sqrt.,-36

22. verbs

kris enjoys action movies at the theatre

23. statistics

Would it be unusual for the mean of a sample of 3 to be 115 or more?

24. english

Hawaii is one of the most beatiful places on earht. what are the verbs in the sentence

25. statistics

In a study of the relationship between self-concept and achievement, a correlation of 0.75 was found. this indicates that the relationship between these two variables is: a) weak and positive b) strong and postitive c) weak and negative Thank You!

26. Marketing

Which of the following is a DEMOGRAPHIC segmenting dimension?

27. statistics

What would you guess the value of the correlation coefficient to be for the pair of variables: "number of man-hours worked" and "number of units of work completed"? a) approximately 0.9 b) approximately 0.4 c) approximately 0.0 d) approximately -0.4 e)

28. math

Which number is equivalent to -7 1/3 ?

29. physics

a ball falls from a height of 10metre. on rebounding it loses 30% energy. upto what height does the ball go?

30. math\

What is thirty−six percent of fifty?

31. physics

An aluminum rod at 18 degrees Celsius has a length of 2.50 meters. At what possible temperatures will it's length change by 1cm?.

32. intermediate algebra

Rowing. Abby rows 10km. upstream and 10km. back in a total time of three hours. The speed of the river is 5km./h. Find Abby's speed in still water.

33. Statistics

Please I Need Help With This Question Showing All Steps...Thank You :) The average number of units that the factory workers at Benzo company assemble per week is μ = 45 with a standard deviation of σ = 12. Assume that the distribution of units assembled

34. Precalc

Hello I need help with this question. I know that the formula for angular velocity is w= theta/time. I also know that the answer is 750 rpm. I am just not sure how to get that answer A truck driver travels at 58 miles per hour. The truck tires have a

35. statistics

The director of an inner-city hospital believes that the average cost per gunshot injury of patients admitted to the hospital’s emergency room is \$18,000. A random sample of 9 gunshot injuries had a mean of \$17,213 with a standard deviation of \$572.

36. physics

The circuit shown in the figure encloses an area of 25 cm2. The magnetic field increases steadily from 0 T to 0.50 T in 0.2 ms. What is the current in the resistor during this time? The circuit has a 9.0 v battery and a 20 ohm resistor

37. Maths

how would you write the following expressions using numbers, parentheses and other mathematical symbols. 1. Double the sum of twenty-five and eight. 2. The quotient of fifteen and three subtracted from the product of four and nine. 3.The difference between

38. Geography

Following the breakup of the Soviet Union, what are some of the major problems faced by many of the new countries? Many of the new countries didn't know how to become democratic. The people weren't used to having a choice, voting, or political parties.

39. English

What is the tone of Tess of the D'urbevilles?

40. Statistics

Verifying Requrements and finding the margin of error Credit rating FICO credit rating scores of a smiple random sample of applicants for credit cards 95% confidence =50,x=677 and is knownd to be 68

41. world civ

Can you help me? Compare and contrast the empires of the Americas with those that emerged in Africa between 500 and 1500 AD. Discuss the roles played by geography, religion, trade, and politics developments in shaping societies in these regions.

42. english

What is the topic sentence in the following paragraph? I believe that paragraph one was a very effective paragraph. It touches a few very interesting points about why someone should create a Living Will. This is especially important to me because of the

43. Biochemistry

calculate Ph occuring when 100ml of 0.10m acid is added to 500ml of 0.08m acetate buffer,pka 4.75,ph 4.5

44. chemistry

Calculate the ph for ch3co2h,3% dissociated at a concentration of 0.02 mol dm-3.

45. Math

Global Telephone charges 30 dollars for monthly phone service, plus a long distance calling rate of 15 cents per minute. After an hour of long distance calling charges,the rate drops to just 5 cents per minute for additional long distance calls. What will

46. chemistry

if the k ion in the blood is 195 mg/ml then what is the molarity of blood

47. Geometry

One hundred tiles of a certain size are needed to pave a floor. If a tile, which measures 4 cm less on each side, will be used, 225 tiles will be needed. Find the size of the larger tile.

48. statistics

Consider the average available for all hotel rooms from the previous assignment. Identify the point estimate of the average number of available hotel rooms in this lesson from each sample. Construct and Interpret a 95% confidence level for the true mean

49. bio

what is the structure of DNA?

50. physics

A tennis ball of mass 0.057 kg is served. It strikes the ground with a velocity of 54 m/s (120 mph) at an angle of 21° below the horizontal. Just after the bounce it is moving at 51 m/s at an angle of 19° above the horizontal. If the interaction with the

51. Science

Over a one-week period, there is a rapid increase in the number of patients entering the emergency room complaining of high fever, lethargy, muscle aches and diarrhea or vomiting. Which method of scientific inquiry would the doctors use to determine the

52. physical science

nitrogen and hydrogen react to form ammonia as follows N2(g)+3H2(g) -2NH3(g)

53. Statistics/probability/maths

Please I Need Help With This Question Showing All Steps...Thank You :) The average number of units that the factory workers at Benzo company assemble per week is μ = 45 with a standard deviation of σ = 12. Assume that the distribution of units assembled

54. statistics

t-test for independent means: n=8 t=-1.33 df= 8 C.V. = plus or minus 2.306 My question is how do you get 2.306 for the cv???

55. intermediate algebra

Given the quadraticf(x)=x^2-14x+49, find a value of x such thatf(x)=36

56. Physics

A 850 kg car skidding on an icy highway at 32.5 km/h slides onto some bare pavement. If the coefficient of friction between the tires and the bare pavement is 0.200, what time(s) does it take for the car to stop? HOW do i get the answer!!!!

57. COM/155 UNIVERSITY COMPOSITION AND COMMUNICATION I

Write six original sentences in which pronouns are used in a consistent manner. What strategies might a writer use to ensure pronouns are used effectively?

58. geology

How do oceans regulate climate?

59. AN UNCERTAIN HORIZON

Which of the following statements is true of the Gulf of Tonkin affair?

60. algebra

3x+4y=12 how to find the slope and y-intercept

61. statistics

A group of students who are female is greater than 0.5. a sample of 120 students reveals that 76 are females. use the 5% leave of significance to test this claim.

62. calculus

Calculus A, Evaluate the following integral : ç (x^2+3x-2)dx

63. Algebra

I am stumped by these two LCM questions for some reason. Find The LCM for #1 2(R-7) and 14(R-7) #2 (1+4r), (1-16r^2), and (1-4r) It seems like #1 is already at the LCM and #2 would be (1+4r)(1-4r) Am I even vaguely correct? Thanks for your help.

64. Middle Childhood Psychology

Definition Gender schema helps the children make sense of their world. A schema for a boy would be “boys play with trucks and are engineers.” A schema for a girl would be girls play with dolls and cannot be scientists.” As children interact with

65. chemistry

statement that is wrong about transition elements is 1) they have fixed oxidation states 2) they show paramagnetic behavior 3) they form interstitial compounds 4) they form complexes

66. physics

Damon, thanks for your answer. Consider that the 20lb object is being pulled behind a bid rig truck traveling at 90mph, can it then be calculated as to what amount of horsepower, is being provided to move (in our case) a 20lb object, traveling at 90mph. If

67. Maths

Find the gradient of the line joining the points (5,2) and (6,3)

68. VA ENTILEMENT

WILL THEY CHANGE?

69. math

Find the quotient: four-ninths divided by eight.

70. hum

One of the key controversies in psychology is nature versus nurture. Is this a problem or an issue?

71. Calculus

Hi! I am having trouble figuring out the derivative of ln[sin^2(x)+3]........... If it weren't for the "3" I know I could just "move" the exponent of 2 from sin^2 to in front of the ln,....but because of the 3 I can't do this....So what should I do? Thank

72. Math

An athlete runs 12 laps on a 400m running track every day for 2 weeks. How many kilometers does she run in total?

73. statistics

The following data is the result of a random sample of the ages (in years) of 12 houses in a community: 18, 22, 23, 19, 18, 24, 26, 17, 12, 27, 28. Construct a 90% confidence interval for the mean age of a house in this community.

74. Medical Terminology

Need help identifying 15 medical terms that would be unfamiliar to non-medical persons. Also providing singular and plural forms of selected medical terms. This is a 47-year-old male who was in his usual state of health until early this evening when he

75. physics

X horsepower is equal an 20lb. Object traveling at 90mph. Is it possible to solve for X? and if so, what does X equal?

76. com155

If I could get some help on the adverbs and adjectives in the following paragraph I wrote. I personally did not have any credit cards for a very long time. In the past I have had more then I needed and found them to just cause me problems. I was young and

77. RETIRED MIL.PAY

WILL IT CHANGE?

78. math

Gary has a length of string for making a yo-yo that is fifty-seven and one-half inches long. He wants to cut that in half to get the proper length. Which expression can be used to find the length of each piece of string?

79. ENGLISH

IS THIS THE CORRECT PUNCTUATION? IT RAINED EVERYDAY ON OUR VACATION;NEVERTHELESS WE HAD A WONDERFUL DAY.

80. world history

During the fourteenth century, Japanese women of aristocratic rank

81. algebra

Write an equation of the line containing the specified point and parallel to the indicated line.(1,4)3x+y=5

82. intermediate algebra

use polynomial long division to divide 25x^3+40x^2+25x+10 by -5x^2-3x-2

83. intermediate algebra

Express in terms of i. 2sq.rt.divided by-36

84. math

At a flea market, 5 out of twelve vendors are selling antiques. What is the decimal equivalent of 5/12

85. physics

An apple of mass 0.1kg is thrown from a 123 meter high building at an angle of 45 degrees with an initial velocity of 5. How long does it take for the apple to hit the ground? (assume g = 9.8 m.s-2)

86. math

Wildlife officials had to rescue and remove seven hundred thirty−five Florida panthers in the past twelve months. It is estimated that there are fifty thousand Florida panthers in existence. What percent of fifty thousand is seven hundred thirty−five?

87. physics

A space probe of mass M is moving with uniform velocity v far from earth and from other massive bodies,and it is planned to deflect from its trajectory through an angle theta by firing from it a suitable mass at velocity v.Derive an expression for the

88. CIS 105

Explore one or more graphics programs available on your computer: Share your experience with the class. What did you like and dislike about the program

t-test for independent means: n=8 t=-1.33 df= 8 C.V. = plus or minus 2.306 My question is how do you get 2.306 for the cv??? Why wouldnt the cv be 2.31?

90. intermediate algebra

Subtract. (5x^6+9x^4-2x^3-3)-(8x^6-8x^5+x^4-4)

91. statistic

the proportion of students who smoke is less that 0.35. a sample of 55 reveals that 20 smoke. use the 10% level of significance to test this claim.

92. physics

If the aim is to let a 700 kg pump float on the surface of water, how many cylinders ( 50cm*90cm ) containing (( 2/3 from total volume / cylinder )) fresh water should we have ?

93. math

What decimal is equivalent to seven and 3 over two hundred fifty?

94. Mathematics

If 1/3 of 2x is 5, what is 2/3 of 4x?

95. Cultural Antrhopology

How does the identification of cultural universals impact our understanding of what it means to be human?

96. math.

If x>0 and x=5y, then square root of x^2-2xy+y^2 is..

97. Chemistry

A gas at a temperature of 95 degrees C occupies a volume of 159 mL. Assuming constant pressure, determine the volume at 15 degrees C.

98. math

Meg has a piece of poster board that is two and two-fifths feet wide. She needs to fold it into three equal sections. How wide will each section be?

99. Math

So let me know if I did this one right please!!!!! 8x+6=2x+9 8x-2x+6=2x-2x+9 6x+6=9 6x+6-6=9-6 6x=3 6/2= 3/6=1/2 x=1/2

100. econ

Suppose that two people, Michelle and James each live alone in an isolated region. They each have the same resources available, and they grow potatoes and raise chickens. If Michelle devotes all her resources to growing potatoes, she can raise 200 pounds

101. TQM(total quality management)

hi can anyone suggest some site that have quizzes on total quality management?i wanna pratice before our exam..thnaks

102. English

What tools are in a "writing toolbox"?

103. Communication

For the following, state the value of the discriminant and then describe the nature of the sloution. -3x^2-8x-19=0

104. chemistry

an example of a transition element having completely filled d-orbital is zn Ti v Cr

105. algebra

simplify 12~ 1/4 + 2/5 - 2^3

What should I do to practice my math and reading before I start school so I can get my brain in gear and havesome time to know what i'm doing that is new.

107. bio

Describe a situation or experience in which you used (knowingly or not) the scientific method.

108. Geology

Did tilting of the Grand Canyon Super Group occur after deposition of the Tapeats Sandstone.

109. science

To an element x(at.no=70)y(at.no=120)is added,if the ratio of atoms should be 1:10E7,then how many gr of y is required to 100gr of x?

110. math

on his first exam, he studied for 10 hours and went to tell the mall for 4hours, and got a score of 85. how long should he study to get a grade of 96 and go to the mall for 17 hours? grade varies directly with studying and inversely with going to the mall.

I need to name ten ways I can use number?

112. Maths

a pack of blank recordable CD's has a mass of 0.8kg. The packaging has a mass of 80g. what is the mass of one CD? Is it 17.6g

113. math

How do I solve 7x=3x+48

114. math

what is 14 inch circumfrence rope diametre equals to

115. Working With Decimals

Compare decimal notation to fractional notation. Which is easier to work with, in your opinion?

116. ethics

managerial ethics in islam

117. maths

lim tan 5x/4x as x approaches to pi

118. Math

If 10=0.1 what does 28 equal?

119. Maths

Increase 500m2 by 25%

120. Algebra

-10 -4 ___ y= ___ they are fractions 13 3

121. math

what is negative three point two as a mixed number in simplest form.

122. math

how can you make this a non- function.f(x){(1,-8),(3,-4),(5,0),(9,4),(10,-2)

123. math

I am trying to simplify these ratios: \$2 : 50c 1.2m : 80cm

124. Math

11x + 28 = 6x + 43