# Questions Asked onJuly 26, 2011

1. ## college physic SHM

A 1.25kg mass stretches a vertical spring 0.215m.If the spring is stretches an additional 0.130m and released, (a)how long does it take to reach the equilibrium position again? (b)Write an equation giving its position y as a function of time t. (c)What

2. ## physics

a car pulling a 1500-kg trailer produces an acceleration of 0.50m/s^2. a)the frictional force in the wheels of the trailer is 125N. what force is the car exerting on the trailer? b) what force is the trailer exerting on the car?

3. ## MicroEcon

The market for apple pies in the city is competitive and has the following demand schedule: Price Quantity Demanded \$1 1,200 2 1,100 3 1,000 4 900 5 800 6 700 etc... 13 0 Each producer in the market has fixed costs of \$9 and the following marginal cost:

4. ## chemistry

The space shuttle environment control system handles excess CO2 (it is 4.0% by mass of exhaled air) by reacting it with lithium hydroxide, LiOH, pellets to form lithium carbonate,Li2CO3, and water. If there are 7 astronauts on board and each exhales 20. L

5. ## physics

A 400.0-m-wide river flows from west to east at 30.0 m/min. Your boat moves at 100.0 m/min relative to the water no matter which direction you point it. To cross this river, you start from a dock at point A on the south bank. There is a boat landing

6. ## geometry

When the sun’s rays are at an angle of 39°, the distance from the top of Dakota’s head to the tip of her shadow is 77 inches. About how tall is Dakota? Round your answer to the nearest inch if necessary.

7. ## Calculus :)

A rectangle is inscribed with its base on the x-axis and its upper corners on the parabola y=6–x^2. What are the dimensions of such a rectangle with the greatest possible area? Find Width=____ & Height=4 just need to find width.. is not 2

8. ## Chem 121

How many grams of NaOH are present in 9.0 mL of a 8.0% (m/v) NaOH solution

9. ## Chem 121

A solution is made by dissolving 0.35 mole of LiI in enough water to give a final volume of 260.0 mL. What is the molarity of the solution?

10. ## Physics

A 63 kg canoeist stands in the middle of her 22kg canoe. The canoe is 3m long, and the end that is closest to land is 2.5m from the shore. The canoeist now walks toward the shore until she comes to the end of the canoe. suppose the canoeist is 3.4 m from

11. ## Chemistry

Cl2+3F2 -> 2ClF3 how many grams of ClF3 form when .204 moles if F2 react with excess Cl2?

12. ## chemistry

How long would it take for 1.50 of water at 100.0 to be converted completely into steam if heat were added at a constant rate of 24.0 ?

13. ## Chemistry

How many liters of excess reactant would be left when 3.00 liters of nitrogen monoxide is mixed with 2.00 liters of oxygen and allowed to react at 695 torr and 27 degrees Celsius to produce nitrogen dioxide

14. ## Psychology

The thought processes that underlie learning: a) Are of great interest to behavioral theorists such as John B Watson and B F Skinner b) can be studied in animals when 'think aloud' instructions are given c) are the main interest of cognitive learning

15. ## Physics

1. A concave mirror forms a real image at 25cm from he mirror surface along the principal axis. If the corresponding object is at a 10cm distance, what is the mirror's focal length? 2. A woman looking in a makeup mirror sees her face at twice its actual

16. ## geometry

A tree 19 feet tall casts a shadow which forms an angle of 49° with the ground. How long is the shadow to the nearest hundredth

17. ## Science

1. A convex mirror with a focal length of -20cm forms an image 15cm behind the surface. If the object height is 1.2cm what is the image height? 2. An object is placed 10cm in front of a mirror and an image is formed that has a magnification of 2. Which of

18. ## Geometry..

Given: A(3,-1), B(5,2), C(-2,0), P(-3,4), Q(-5,-3), R(-6,2). Prove: angles ABC and RPQ are congruent by completing the paragraph proof. AB=RP=13, BC=(?)=53, and CA=QR=26. So segment AB is congruent to (?), segments BC and PQ are congruent and segment CA is

19. ## Science

What is the density of an object that has a mass of 550 grams and displaces 25 mL of water? Select all that apply -22mL/g -.04 mL/g -22 g/mL -22 g/cm 3

20. ## algebra

completely factor the following expression. 16a^2-40ab+25b^2

21. ## math

when graphing greater than, less than, etc. do you shade and if you do which way do I shade?

22. ## science

Hydrochloric acid is added to a beaker containing a piece if zinc. As a result,zinc chloride is formed and hydrogen gas is released. This is an example of ?

23. ## college physic

A 1.25kg mass stretches a vertical spring 0.215m.If the spring is stretches an additional 0.130m and released, (a)how long does it take to reach the equilibrium position again? (b)Write an equation giving its position y as a function of time t. (c)What

24. ## math 163(discrete math)

how many different functions are there from a set with 10 elements to a set with the following numbers of elements: a)2 b)3 c)4 d)5

25. ## math

A library crew can shelve books in six hours. Another crew can do the job in four hours. If the first crew begins and is joined by the second crew one hour later, how many hours will it take to finish the job?

26. ## MATH

A disc jockey has 12 songs to play. Seven are slow songs, and five are fast songs. Each song is to be played only once. In how many ways can the disc jockey play the 12 songs if The songs can be played in any order. The first song must be a slow song and

27. ## Calculus

At 2:00PM boat X is heading due west at 15mph towards a dock that is exactly 15 miles away. At the same time boat Y leaves the dock traveling due north at a speed of 20mph. At what time will the boats be closest together?

28. ## Algebra II

If x Ω y is defined as the smallest integer of which both x and y are factors, then 10 Ω 32 is how much greater than 6 Ω 20? A. 2 B. 70 C. 100 D. 160 E. 200

29. ## Math-New Questions

Social Security Numbers A social security number consists of nine digits. How many different social security numbers are possible if repetition of digits is permitted? Is it 9^10?? 10 numbers correct?

30. ## Math

An identification code is to consist of six letters followed by three digits. How many different codes are possible if repetition is permitted? Is it 6^3??

31. ## geometry

A power pole broke To the nearest tenth of a meter, what was the original height of the pole opp=7 meters adj=11 meters

32. ## algebra

Completely factor the expression. 36x^3- 96x^2y+64xy^2

33. ## calculus

My problem is that a stft above the sidewalk. a man 6ft tall walks away from the light at the rate of 3ft/sec. at what rate is his tip of shadow moving

34. ## English

I have to write a debate on the topic "Trying to be friends parents have now forgotten parenting" I am speaking for the motion. I have to speak for 3 mins

35. ## Chemistry

If a buffer solution is 0.200M in a weak acid (Ka=1.6*10^-5)and 0.480 M in its conjugate base what should the pH be?

36. ## college algebra

A musician is planning to market a CD. The fixed costs are \$1260 and the variable costs are \$5 per CD. The wholesale price of the CD will be \$11. For the artist to make a profit, revenues must be greater than costs. How many CDs, x, must be sold for the

37. ## geometry

Find the length of the leg of this right triangle. Give an approximation to 3 decimal places. hyp=24 adj=22

38. ## Geometery

I am ask to write a two column proof. Given that AD is the diameter of circle O, and DC is tangent to O at D. Prove that Triangle ABD ~ (congruent) to triangle ADC

39. ## Physics

The radius of the Earth is 6.38 x(10^6)m. How far (path length) does a point on the equator move if the Earth rotates... a. 20 degrees b. 20 radians c. 20 revolutions

40. ## MATH

write, in extended form, a polynomial(with real coefficients) of degree 3, with solutions 2,2-i.

41. ## science

1. A convex mirror with a focal length of -20cm forms an image 15cm behind the surface. If the object height is 1.2cm what is the image height? 3. A solid glass sphere with a radius of 5cm and index of refraction of 1.52 has a small coin embedded 3cm from

42. ## algebra

determine whether the ordered pair is a solution of the inequality (-8,5);4x+y

43. ## physics

A gun is mounted at the top of light house of height h. A similar gun is mounted in the boat in the sea. Both the guns can fire shots with speed upto under root 2gk, where k>h. What will be the area in which gun at the top can be gun in the boat, but gun

44. ## Statistics- Standard Error

A population of 200 voters contains 52 Republicans, 128 Democrats, and 20 independents and members of other parties. A simple random sample of 20 voters will be drawn from this population. The expected number of Republicans in the sample is ______ ? The

45. ## algebra

Megan factored the expression 12x^2+13x-14 as (3x+2)(4x-7). But when Jacob applied the foil principle and multiplied out(3x+2)(4x-7), he got 12x^2-13x-14; thus, Megan's solution does not appear to check. Why is that? Please help Megan to understand this

46. ## English

This is my first paragraph of my essay. Help! Imagine being given a name that every kid would make fun of and everyone always questioning “Why would your parents do such a thing?” The man knew the pros and cons of having such a very unusual name,

47. ## Psychology

Charlene flew to see her grandparents on a plane that was piloted by Janet Harris. When Charlene arrived they asked her how she enjoyed the flight. "It was a wonderful flight, and the pilot was very good. He was able to avoid turbulence." Charlene's

48. ## english

what is a good thesis statment for a descriptive essay about a horror film?

49. ## Math

A piece of cardboard has a length of 60cm and a width of 40cm. In order to make the cardboard into an open box, a box with no lid), a piece of length x must be cut out of each corner. Write an equation to represent each dimension of the box.

The Everton college store paid \$1859 for an order of 49 calculators. The store paid \$11 each for scietific calculators. The others, all graphing calculators, cost the store \$55 eaach. How many of each type of calculator ws ordered? Please answer in detail

51. ## calculus

Solve the equations i) log2(x + 2) + log2 x = 3. ii) 25^x + 5^x+1 + 6 = 0.

52. ## Math

Social Security Numbers A social security number consists of nine digits. How many different social security numbers are possible if repetition of digits is permitted? Is it 9^10??

53. ## Spanish

Hi, I am preparing for a spanish skit for my class. Can someone check if this translation is correct. You have a great smile and great hair to match it. --> Tienes una gran sonrisa y el pelo muy a su altura. thanks

54. ## inforrmation tech/marketing

hi i just made this paper about information technology on business and marketing, im not really good at it so please check my work and maybe revise alittle thanks so much :) need it later hehe :D thanks As industry and commerce have increased their use of

55. ## English

I have to write an essay on second hand lion about an important idea in the film and why it is a worthwhile idea in the film. I want to do the importance of the past because of the flash backs do you think this is the right idea and if so what should my 3

56. ## Geometry

M and N are the midpoints of PR(which has a line over PR) and QR(which has a line over QR)respectively. Using graph paper, repeat this process from the last problem using different coordinates for P, Q, and R. How do these lengths MN and PQ compare now?

57. ## math

whats interval notation?

58. ## Math-New Question

One card is selected from a deck of playing cards. Determine the probability of selecting: a card greater than 9 or a black card

The way business communication is conducted [Passive voice] in the workplace experiences regular changes with the advances in technology that makes communication faster and easier.

60. ## algebra

Find the amount of compound interest earned in an account that opens with \$21,000, earns 4.2% interest compounded daily, and is held for 5 years. Assume 360 days in a year.

61. ## intermediate algebra

factor out the greatest common factor from the expression 24xyz^2+20x^2yz-4x^2z^2

62. ## statistics

A population of 200 voters contains 52 Republicans, 128 Democrats, and 20 independents and members of other parties. A simple random sample of 20 voters will be drawn from this population. The expected number of Republicans in the sample is? and The

63. ## statistics

You want to estimate the grades of st2%atistics students who gets grades of C or better. How many students should you survey to be 95% confident that the sample percentage is off by no more than 2 percentage points.

64. ## biology

i need an article that can explain the scientific method to create hypothesis or designing an expermient

65. ## Math

( 7-(-9)4 - (35 divide 7)4

66. ## Math

Which pair has equally likely outcomes? List the letters of the two choices below which have equal probabilities of success, separated by a comma. A standard deck of cards has 12 face cards and four Aces (Aces are not face cards). A. drawing a red seven

67. ## Bio

What path does food take through the digestive and excretory

68. ## geometry

P(2,1), Q(11,1), and R(8,7) M and N are the midpoints of PR and QR respectively. Find MN and PQ. How do these lengths compare with each other?.

69. ## Alg 2

a rectangular picture frame measures 8 inches by 4 inches. You want to triple the frame's area by adding the same distance, x, to the length and width. Find the value of x and find the new dimensions of the frame. How do you do this?? Please show work

70. ## physics

what is the distance and displacement of the race car drivers in the 15m?

71. ## science

Is filtered water unhealthy for my fish because the electrolytes have been removed in the process?

72. ## math

is this correct? Completely factor the following expression: 64y^2-49z^2 Is the answer: 128 y-49

73. ## Math

One card is selected from a deck of playing cards. Determine the probability of selecting: a card greater than 9 or a black card.

74. ## algebra

The length of a rectangle is 2 meters more than its width. If the area is 35 square meters, what are the length and width?

75. ## bio

i need to compare structure and !@#\$%^&tion of diffrent cells types? can i get a helpful link for this?

76. ## physics

how much energy is needed to heat 180g of ice from 72 degrees celsius to 220 degrees celsius

77. ## math

The half-life of 234U, uranium-234, is 2.52 multiplied by 105 yr. If 97.4% of the uranium in the original sample is present, what length of time (to the nearest thousand years) has elapsed?

78. ## Maths

Mean of n numbers X1, X2,--------Xn is m. If Xn is replaced by x the new mean is

79. ## algebra

The distance across a lake is 34 meters. What is the distance, h, between the boat ramp and the dock? Round your answer to the nearest meter and show your work.

80. ## English

Could you please check these sentences on illnesses, please? Thank you in advance. 1)I’ve got backache as a consequence of my slipped (herniated?) disc. I need to express this when I’m at the chemist’s or at the doctor’s. I need also to express

81. ## Math

Trigonometry Identities problem: Prove the following; (tan^2x)(cos^2x) = (sec^2x - 1)(1-sin^4x) ÷ (1+sin^2x)

82. ## English

Broad Subject-Phonebook Character Limited Topic for Thesis Statement- Oliver Tolivr Main Idea- Wealthy Buisness Man Three Step Format #2 Appearance-Sloppily dressed #3 Surroundings-State of the art mansion #4 Actions-Penny pinching ways Thesis Statement:

83. ## chemistry

if aluminum chloride and copper sulfate make 48g of aluminum sulfate how many grams of copper sulfate was used ?

84. ## American History

the colonials used both peaceful and violent methods to oppose the British policies imposed on America from 1763-1775. what is one violent way and one peaceful way

85. ## MAT 117 - ALGEBRA 2

The costs of doing business for a company can be found by adding fixed costs, such as rent, insurance, and wages, and variable costs, which are the costs to purchase the product you are selling. The portion of the company’s fixed costs allotted to this

86. ## geometry

the circle below has a radius of 10 cm. what is the area of the shaped region ? if necessary, round your answerto two decimal places. do not include units in your answer

87. ## Math

Simplify: (3x+5)^3-3x(x^2-1)

88. ## physics

An object moving with constant acceleration at time t=0 its speed is v. , at t=t. its speed is v./2 , at t=2t. its speed is v./4 . What will be its speed at time t=3t.?

89. ## algebra

Factor x3+8 x2+4x +32=

90. ## algebra

______ /b2-4ac; b=3, a=-1, c=-2 What would the solution be?

91. ## algebra

A 20-ft diagonal brace on a bridge connects a support of the center of the bridge to a side support on the bridge. The horizontal distance that it spans is 4 ft longer than the height that reaches on the side of the bridge. Find the Horizontal and vertical

92. ## math

If you purchase an item for \$1,263 at an interest rate of 9.8%, and you finance it for 1 year, how much is the amount of add-on interest? (Round your answer to the nearest dollar.)

93. ## Expert Medical Coding

Can anyone help me with some coding assignments

94. ## Math

find a quadratic equation having 3+root3 and 3-root3

95. ## math

solve the problem. the half-life of 234U, uranium-234, is 2.52 multiplied by 105 yr. If 98.3% of the uranium in the original sample is present, what length of time (to the nearest thousand years) has elapsed?

96. ## Math

What is the answer to the below math problem? 78000 x (1.7% x 20 years) + (1% x 10 years)

97. ## Spanish

Help please, are all my answers correct? Distingue entre todos los usos con se en las oraciones a continuación. 1) Allí es donde _______ coches/carros/autos de Europa. Vamos mañana para buscar uno para comprar. A) fueron vendidos B) se venden C) se me

98. ## construction

How many square yards would it take to cover a ball that had a radius of 3'?

99. ## math

How many sheets of plywood would it take to sheath a roof that covered a building 74' wide,248' long and has a roof pitch of 4" in 12"?

100. ## Algebra

The percent decrease from 5 to 4 is how much less than the percent increase from 4 to 5? A. 0% B. 5% C. 15% D. 20% E. 25%

101. ## algebra

use the "difference of squares" rule to factor the following expression. 64z^4-81a^4

102. ## Math

Driving at 46 MPH, one can cover 17 miles in what seconds?

103. ## math

find a quadratic function whose graph has a max of 25 and x-intercepts of -3 and 2.

104. ## phiisical science

Suppose an unknown substance has a melting temperature of 1,200 degrees Celsius and a density of 16.7 g/cm3.

105. ## algebra

solve by the substitution method: 8m+n=47 m-5n=52 thank you having trouble completing please show all work so I can learn better

106. ## Geometry

Given: A(3,-1), B(5,2), C(-2,0), P(-3,4), Q(-5,-3), R(-6,2). Prove: angles ABC and RPQ are congruent by completing the paragraph proof. AB=RP=13, BC=(?)=53, and CA=QR=26. So segment AB is congruent to (?), segments BC and PQ are congruent and segment CA is

107. ## anatomy

Voluntary actions are controlled within the _________ of the frontal lobe

108. ## intermediate algebra

compleletly factor the following expression 9y^2-16z^2

109. ## Maths Fractions

write two equilvalent fractions for 3/15.

110. ## construction

A swimming pool is 120' long,45' wide and 10' deep.How long would it take to fill with water if your maximum fill rate was 15 gallons per minute?

Which of the following is usually installed by the manufacturer?

112. ## math

factor out the greatest common factor -36m^2n^3-60mn^4+18m^4n^2

113. ## child care

an important step in reducing bias is to (a)help children choose the right friends (b)provide children with appropriate models (c)avoid children's questions about differences (d()reinforce media messages. i put b am i correct To encourage positive self

114. ## math

solve by the substitution method 5x+7y=6 -6x+y=21

115. ## Math

Given that P(A) = 0.5 and P(B) = 0.3, and P(A and B) = 0.21, determine P(B|A).

116. ## math

solve by elimination method o.3x-0.2y=4 0.4x+0.3y= 49/23

117. ## college algebra

(x^2/3)^7/2 simplify and express answer using positive exponents only

118. ## MATH-SO LOST :(

A mini license plate for a toy car must consist of a number followed by two letters. Each letter must be a C, A or R. Each number must be a 3 or 7. Repetition of letters is permitted. Use the counting principle to determine the number of points in the

119. ## Maths

If mean of 1, 2, 3, --------- n is 6n/11, then n is

120. ## intermediate algebra

factor out the greatest common factor from the expression 6x^3yz^4-3x^2y^3z^4-18^4y^2z^3

121. ## algebra

factor the following expression into a product of two binomials. 64x^2-64x+16

122. ## Math

can radical 2 minus 8 divided by 22 be further reduced?

123. ## grammar

Because subtle changes can reveal future abnormalities. Does the word because make this a fragment or is it correct as it is?

124. ## math

y= 7 /4x f(1)f(2)

125. ## college algebra

find a general term for the sequence a1,a2,a3,a4..... 15,23,31,39

126. ## english

write a 100-passage to scott mclean, the author of the course's textbook, in which you describe five details from her book that are good and five details about the book that are written well.

127. ## history 135

write a persuasive,formal letter (50 to 850 words) to a fellow american of the era discussing why the U.S. became in the politics of Southeast Asia, how this involvement affected the U.S. political climate of the 1950s, and argue that the U.S. actions were

128. ## Math

Find the point that is 3/4 the way from A(-2,-6) to B(8,10)

129. ## math

a bag contain balls, all but 4 r red, all bt 4 r green, all bt 4 r blue..then hw many balls r there

130. ## Math

Reiny can you show me how to check this problem. 5a^8-20a^7-25a^6 =5a^6(a^2-4a-5) =5a^6(a^2-5a+a-5) =5a^6(a(a-5)+1(a-5) =5a^6(a-5)(a+1) (answer)

131. ## Algebra

factor out the greatest common factor -36m^2n^3-60mn^4+18m^4n^2

132. ## math

when in life would one ever have a question relating to powers in the real world ex 5x5x5x5x5x5 Anyone have an idea

133. ## cgd 218

What do the comics strips reflect about American culture?

134. ## trinity

why are people faster than others

135. ## CALCULUS :)

find y' of y=sinθ tanθ sqrt(θ^3)

136. ## intermediate algebra

completely factor the expression 150x^2-420xy+294y^2