# Questions Asked onJanuary 2, 2011

1. ## Physics

An 800N billboard worker stands on a 4m scaffold weighing 500N and supported by vertical ropes at each end. How far would the worker stand from one of the supporting ropes to produce a tension of 550N in that rope?

2. ## Physics

When a driver applies brakes to keep a car going downhill at constant speed and constant kinetic energy, the potential energy of the car decreases. Where does this energy go? Where does most of it appear in a hybrid vehicle?

3. ## Statistics and Probability

it has been estimated that about 30% of frozen chickens contain enough salmonella bacteria to cause illness if imprperly cooked. A consumer purchases 12 frozen chickens. What is the probability that the consumer will have more than 6 contaminated chickens?

4. ## Chemistry

given the balanced equation representing a reaction: 4NH3+5O2-->4NO+6H2O what is the minimum number of moles of O2 that are needed to completely react with 16 moles of NH3? (1)16 mol (2)20.mol (3)64 mol (4)80. mol i think its 2 but im not sure.

5. ## Chemistry

calculate the percent composition, by mass, of carbon in Na2CO3. please explain how you get the answer.

6. ## Calc

If dy/dx = x²y², then d²y/dx² = ?

7. ## Math

How did the Hunter get hurt while benind over to study some tracks? Algebra with Pizzazz! pg 123 OBJECTIVE: to divide a polynomial by a binomial EX: (x^2+8x+150/(x+5)

8. ## Chemistry

Given the balanced equation representing a reaction: 2CO(g)+O2(g)-->2CO2(g) what is the mole ration of CO(g) to CO2(g)in this reaction? (1)1:1 (2)1:2 (3)2:1 (4)3:2

9. ## Chem

what is the empirical formula of aspirin, C9H8O4? is it the same again ?

10. ## Calc

If f(x) = e^(sin x), how many zeros does f '(x) have on the closed interval [0, 2π]?

11. ## Algebra 1

A lab technician has a 15 percent alcohol solution and a 35 percent alcohol solution. She wants to make 100 gallons of a 29 percent alcohol solution. How much of the 15 percent solution should she use?

12. ## Calc

Let f be the function given by f(x) = tan x and let g be the function given by g(x) = x^2. At what value of x in the interval 0≤x≤π do the graphs of f and g have parallel tangent lines?

13. ## Chemistry

what is the gram formula mass of CaSO4*2H20?

14. ## calculus ap

what is the slope of a line tangent to y=sin^2(5x+pi) at x=pi/4?

15. ## Physics

Hunting a black hole. Observations of the light from a certain star indicate that it is part of a binary (two-star) system. This visible star has orbital speed v = 270 km/s, orbital period T = 1.6 days, and approximate mass m1 = 6.0Ms, where Ms is the

16. ## physics

three point particles are fixed in place in an xy plane. Particle A has mass mA = 3 g, particle B has mass 2.00mA, and particle C has mass 3.00mA. A fourth particle D, with mass 4.00mA, is to be placed near the other three particles. What (a) x coordinate

17. ## math

Write a missing addend addition sentence to help solve 78-49.explain how you would use it.

18. ## algebra

Two cars are driving toward each other from opposite directions. If one is driving 55 mph, the other is driving 60 mph and the cars are 500 miles apart, how long will it be before they pass each other? Round to the nearest tenth of an hour

19. ## physics

a device for training astronauts and jet fighter pilots is designed to rotate the trainee in a horizontal circle of radius 10 m. if the force felt by the trainee is 7.75 times her own weight, how fast is she rotating? express in both m/s and rev/s

20. ## Calc

Let f and g be differentiable functions such that f(1) = 4, g(1) = 3, f '(3) = -5 f '(1) = -4, g '(1) = -3, g '(3) = 2 If h(x) = f(g(x)), then h '(1) = ?

21. ## math

find four consecutive integers such that the sum of the squares of the first two is 11 less than the square of the fourth

22. ## algebra

can someone please help me. The perimeter of a rectangle is 80m. The length is 7m more than twice and width. Find the dimensions. I would appreciate help with the steps so I can practice it for the my next problem. Thanks.

23. ## Calc

If f is the function defined by f(x) = cube root of (x² + 4x) and g is an antiderivative of f such that g(5)=7, then g(1) is approx. equal to...?

24. ## Math

I don't get page 50 of algebra with pizzazz! Please help? 7) Kathy is 6 years younger than bill. 12 years ago bill was twice as old as Kathy was then. How old are they now?

25. ## Chemistry

what is the percent by mass of nitrogen in (NH4)2CO3? how do you do this ?

26. ## calculus ap

what is the slope of the line tangent to the curve y^3+x^2y^2-3x^3=9 at the point (1,2)?

27. ## physics

Two Earth satellites, A and B, each of mass m, are to be launched into circular orbits about Earth's center. Satellite A is to orbit at an altitude of 7460 km. Satellite B is to orbit at an altitude of 20500 km. The radius of Earth REis 6370 km. (a) What

28. ## Physics

Which of these types of motors or engines are heat engines? a. an automobile engine b. an electric motor c. a steam turbine

29. ## Physics

Could a simple machine such as a lever, a pulley system or a hydraulic jack be considered a heat engine? Explain your answer. I feel that its the hydraulic jack because if friction is created, heat is also created. I'm not sure though.

30. ## Calc

The graph of y = 3x^2 - x^3 has a relative maximum at what point?

31. ## Economics

How does high unemployment lead to consumer confidence improving? I looked up Consumer confidence which is the degree of optimism that consumers feel about the overall state of the economy and their personal financial situation. But wouldn't high

32. ## Physics

If a car drives off a 40 m high cliff with a horizontal velocity of 15 m/s, how far from the base of the cliff will the car strike the fround? Could someone help with the equation, please

33. ## Calc

How do you solve ∫sin(3x+4)dx? I got the -cos(3x+4) part, but do you have to integrate the 3x+4 too? Does chain rule apply?

34. ## reinforcement

what is withdrawing or withholding reinforcement and how does it relate to the developmental-behavioral approach?

35. ## physics

Assume a planet is a uniform sphere of radius R that (somehow) has a narrow radial tunnel through its center. Also assume we can position an apple anywhere along the tunnel or outside the sphere. Let FR be the magnitude of the gravitational force on the

36. ## statistics

what is the sample space for this experiment: select two cards from a deck of 52 cards and observe the color of each card drawn.

8y-11

38. ## Algebra 1

find slope 2x-20y+18=0 I've been braking my head and I just can't find the solution. Can you please help me. I would really appreciate your help. Thank you so very much. I now it's m= something, but I don't know what the answer is. Thanks, again!

39. ## Physics

A 96kg soul ascended to heaven at a speed of 12m/s, when he bumps against a 50 kg soul descending to hell at the speed of 15m/s, assuming that soul number 2 has an initial speed of 1m/s, find the initial speed of soul number 1.

40. ## Math

Mark each of the following True or False. ___ a. All vectors in an orthogonal basis have length 1. ___ b. A square matrix is orthogonal if its column vectors are orthogonal. ___ c. If A^T is orthogonal, then A is orthogonal. ___ d. If A is an n*n symmetric

41. ## Chemistry

After calculating the mass of NaOH to make the approximate 0.2mol/L solution, why is it not crucial to weigh out an exact amount?

42. ## geometry

If the smaller leg of a 30-60-90 triangle is 4 m, what are the lengths of the longer leg and the hypotenuse?

43. ## algebra 2

what is a number where the square of itself is 195 more than twice the number

44. ## algebra

Find the value of x so that the line passing through the points will have the given slope: (x, 6) and (10, -3) with a slope of -3/2. Type only the number in the blank

45. ## algebra

Let f(x) = 9x - 4.5. Find the value of f(2).

46. ## algebra

Let h(x) = 2x + 7. Find the value of h(x) + 14

47. ## algebra

This is a response to bobpursley's answer of Pr(0) = .3; Pr(1) = 7*.3; Pr(2) = 7*.7. Can you show me how you arrived at the above answers? Also, what does * mean? Thanks.

48. ## grade 9 science biology

What activities increase the amount of carbon dioxide in the atmosphere? What activities decrease the amount of carbon dioxide in the atmosphere?

49. ## calculus

If g is a differentiable function such that g(x) is less than 0 for all real numbers x and if f'(x)=(x2-4)g(x), which of the following is true? f has a relative maximum at x=-2 and a relative minimum at x=2, f has a relative minimum at x=-2 and has a

50. ## Calc

t(sec) | 0 | 2 | 4 | 6 | 8 | ____________|_____|_____|_____|____|_____| a(t) (ft/sec²) | 2 | 3 | 4 | 3 | 2 | The table for the acceleration of a particle from 0 to 8 seconds is given in the table above. If the velocity at t=0 is 4 feet per second, the

51. ## math

find a number where the sum of itself and its cube is the same as twice the square if it

52. ## geometry

If Quadrilateral QRST is a parallelogram, which is not necessarily true? a. Opposite angles are congruent. b. The diagonals bisect each other. c. Angles are four right angles. d. Consecutive angles are supplementary.

53. ## Pre Calc , Math

Find the 6 Trig ratios of -7Pie/3

54. ## ap physics c

Hi! I am struggling with this problem-- any help would be much appreciated-- thank you astronauts on their way to the moon reach a point --> at this point, the moon's gravitational pull becomes stronger than the earth's gravitational pull-----find the

55. ## geometry

ABCD is a square. If , find the value of x. a. x = 90 b. x = 17.25 c. x = 45 d. x = 8

56. ## Algebra 2

How do solve (x^2/3) +1 = 9?

57. ## math

The perimeter of a rectagle is 50 centimeters. The length of the rectangle is one more than 3 times the width of the rectangle. What are the demensions of the rectangle?

58. ## Science

What are three major stages that must occur in order for glucose to be converted to carbon dioxide and water in aerobic conditions?

59. ## Calc

The amount A(t) of a certain item produced in a factory is given by A(t) = 4000 + 48(t - 3) - 4(t - 3)³ where t is the number of hours of production since the beginning of the workday at 8:00 am. At what times is the rate of production increasing most

60. ## geometry

if the sum of the measure of four angles of a pentagon is 396, determine the measure of the fifth angle

61. ## Physical Science

I have a really good grade in this class and I need to keep it that way. I am only asking to have my answers checked. I would like to graduate with honors so please help if you can. 1. A car traveling along the highway needs a certain amount of force

62. ## Chemistry

perform the operation & leave answer correct amount of significant numbers. A) 3.76+4.318+ 0.005 B) 29.0- 52.0+ 37. please help don't know how to do !

63. ## geometry

Equilateral triangle has area of 9 times the square root of 3 inches. How many inches is perimeter?

64. ## math

a christmas tree is 34 feet tall. it casts a shadow 24 feet long. toms christmas tree is standing beside the tree at rockefeller center and is 5 feet 8 inches tall. how long of a shadow would toms tree cast?

65. ## human resources

How do I create a Diversity Training Manual that cover diversity issues such as religious, ethnic, gender and age?

66. ## Physics

A person takes in a breath of 13*C of air and holds it until it warms to 36.5*C. The air has an initial volume of 0.24 L and a mass of 0.00077kg. a. Determine the work done by the air on the lungs if the pressure remains constant at 1 atm. Answer in units

67. ## citizenship education

five attribute of respect

68. ## math

use either substitution or elimination to solve 9x+5y=-6 4x+3y=2

69. ## math

use either substitution or elimination to solve 8x+15y=13 2x-5y=-1

70. ## Statistics

A coin is tossed five times. Find the probability of getting four tails. I realize that getting four tails is the exact same thing as getting only one heads, but how would you figure out this problem using probability rules? Thanks for your time, I

71. ## biology

List,explain and provide an example of 3 natural interactions that exist between species.

72. ## calculus ap

find limit as x goes to infiniti of 8x^4-3x^2+2 over 9x^5+7x^4-3x^2+2

73. ## Economics

explain why the cost tructure associated with many kinds of information goods and services might imply a market supplied by a small number of large firms. At the same time, some internet businesses such as grocery home deliveries have continually suffered

74. ## Physics

1. A 2,000 kilogram truck traveling at 60km/h strikes a tree and stops in 0.75 seconds. How large is the force that causes this to occur?

75. ## Physics

How much work is done by a boy weighing 450. Newtons while carrying a 20.0 kilogram package up a 2.00 meter flight of stairs?

76. ## c

what is the average rate of change for the function g(x)=3x^2-4 over the interval (-1,3)?

77. ## geometry

right triangle. One side =8. Hypo = 3x+11. Whatare all possible values for x?

78. ## algebra

Please help! Does this question have a formula, if so how can I answer this question without the formula? Is it possible. Hockey teacm receive 2 points when they win and 1 point when they tie. The team won a championship with 50 points. They won 10 more

79. ## Math

a JACUZZI IS 3FT DEEP SEATS 6 PEOPLE 2'WIDE PER SEAT 150 CUBIC FEET

80. ## Algebra

Joseph wanted to throw a ball to John who was on a balcony 32 feet above him,so he tossed it upward with an initial speed of 48ft/sec. John missed it on the way up but caught it on the way down. How long was the ball in the air? What was its maximum

81. ## Math

A triangle has sides with lengths of 3x, 5x, and 8x. Express the perimeter of the triangle in terms of x. Please help!!!

82. ## physics

A freight train has a mass of 6.5 107 kg. If the locomotive can exert a constant pull of 11.5 105 N, how long would it take to increase the speed of the train from rest to 85 km/h? s

83. ## physics

Four forces act on a hot-air balloon with F1 = 1660 N and F2 = 5040 N , shown from the side in Figure 4-29. Find the magnitude and direction of the resultant force on the balloon. N ° (counterclockwise from the horizontal)

84. ## physics

Four forces act on a hot-air balloon with F1 = 1660 N and F2 = 5040 N , shown from the side in Figure 4-29. Find the magnitude and direction of the resultant force on the balloon. N ° (counterclockwise from the horizontal)

85. ## Chemistry

given the equation Mg +2HCL --> MgCL2+H2, how many moles of hydrochloric acid are needed to react with O.50 mol of magnesium ? (1)0.5 (2)1.0 (3)2.0 (4)4.0 is it 3 ?

86. ## Calc

A line through the origin rotates around the origin in such a way that the angle, θ, between the line and the positive x-axis changes at a rate of dθ/dt for time t≥0. Give the expression for the rate at which the slope of the line is changing.

87. ## science

A crab shell is buried in sediments. The sediments get pressed and squeezed into stone. Meanwhile, the crab shell gets washed away leaving a hollow space the shape of a crab shell. What kind of fossil is this?

88. ## Chem

what is the gram atomic mass of zinc? is gram atomic mass the same as atomic mass ?

89. ## Physics

Could a simple machine such as a lever, a pulley system or a hydraulic jack be considered a heat engine? Explain your answer. I feel that its the hydraulic jack because if friction is created, heat is also created. I'm not sure though.

90. ## physics

how many revolutions per minute would a 15 m ferris wheel need to make for passengers to feel weightless at the top?

91. ## Calc

If t is measured in hours and f '(t) is measured in knots, then integral from 0 to 2 of f '(t)dt = ? (Note: 1 knot = 1 nautical mile/hour)

92. ## Math

A triangle has sides w/ lengths of 3x, 5x, and 8x. All of the sides add up to 180. Express the perimeter of the triangle in terms of x. PLEASE HELP!!!!!

93. ## math

Carmen and hannah bought lunch at the pizza shop. Carmen ordered two slices of pizza an three cans of juice. Hannah ordered three slices of pizza and two cans of juice. Carmens bill was \$5.25 and hannahs bill was \$6.00. What was the price of one slice of

94. ## math

if the sides of a square are increased by 5 cm the area of the new square is four times the area of the original square. Find the length of a side of the original square.

95. ## mat116

help me please. the perimeter of a rectangle is 120 inches. The length exceeds the width by 10 inches. Find the length and the width.

96. ## Physics-Gravitation

What is the gravitational potential energy of a two-particle system with masses 5.4 kg and 5.0 kg, if they are separated by 1.3 m? If you triple the separation between the particles, how much work is done (b) by the gravitational force between the

97. ## math

how mant 5ths are in the number 1

98. ## reinforcement

what is incompatible reinforcement and how does it relate to the developmental-behavioral approach?

99. ## English

I forgot to include these few more sentences.Thank you very much. 1) I was given/granted 30% off (discount?) on the purchased items (?). How long do Janary sales last in America? 2)When you go skiing you can choose among one-day, half-day and weekly

100. ## Physics

Four uniform spheres, with masses mA = 37 kg, mB = 30 kg, mC = 220 kg, and mD = 55 kg, have (x, y) coordinates of (0, 50 cm), (0, 0), (-77 cm, 0), and (44 cm, 0), respectively. Find the net force on sphere B due to the other spheres. What are the (a)x and

101. ## trig

verify : [sec(x) / csc(x) - cot(x)] - [sec(x) / csc(x) + cot(x)] = 2csc(x)

102. ## algebra

Is the following always, sometimes or never true? X + 1 = X + 0

-1/6m=22

104. ## English/Psychology

1. What is a Positive Change as being a successful student in college? How will you know if a student is SUCCESSFUL (doing positive things)? Positive Change for becoming a successful student in college involves getting a clear picture about the harmful

105. ## physics

A dog pulls on a pillow with a force of 19 N at an angle of 42° above the horizontal. Find the x and y components of this force.

106. ## physics

A 6 kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 2.4 m/s2, find the force exerted by the rope on the bucket of water.

107. ## Physical Science

The only force acting on a satellite in its orbit around Earth is the force of gravity from Earth. Why does a satellite not fall down?

OK so can u guys help me compare/contrast A Tale of Two Cities to A Christmas Carol by Charles Dickens.. like compare characters,plot,theme,or writing style.. thx

109. ## AP World History

I need some continuities and changes in economy in the islamic world from 600-1750 AD, please help? Just a list would be fine with me thank you!!! :D

110. ## physical science

when items float freely inside a space capsule, is it an example of Newton's law #1 or #3? As soon as the astronauts take off their helmets and gloves (after lift-off) in Apollo 13, the gloves float away. So is that an object in motion tends to stay in

111. ## COM170

I am to identify all writing errors and correct them. Can you tell me if I did it right. The errors can be in the following categories: comma usage,question marks, quotation mark, andapostrophes, capitaliazion,colons, and semicolons, and commonly misuesd

I posted this earler and you gave me help, could you please check what I did? Thank you If a car drives off a 40 m high cliff with a horizontal velocity of 15 m/s, how far from the base of the cliff will the car strike the ground? Could someone help with

113. ## Algebra 1

find slope 2x-20y+18=0 I've been braking my head and I just can't find the solution. Can you please help me. I would really appreciate your help. Thank you so very much. I now it's m= something, but I don't know what the answer is. Thanks, again!

114. ## Finance

I've been doing this one over and over, consistently getting wrong answers. I know the process of how to do it generally, but I feel I make mistakes in calculating either depreciation or changes in net working capital. Here's the problem: Aguilera

115. ## Algebra 1

find slope 2x-20y+18=0 I've been braking my head and I just can't find the solution. Can you please help me. I would really appreciate your help. Thank you so very much. I now it's m= something, but I don't know what the answer is. Thanks, again!

116. ## physics

A child and sled with a combined mass of 40.0 kg slide down a frictionless hill. If the sled starts from rest and has a speed of 9.0 m/s at the bottom, what is the height of the hill? m

117. ## physics

A child and sled with a combined mass of 40.0 kg slide down a frictionless hill. If the sled starts from rest and has a speed of 9.0 m/s at the bottom, what is the height of the hill? m

118. ## Calc

If the integral of (x^2 - 2x + 2)dx from 0 to 6 is approximated by three inscribed rectangles of equal width on the x-axis, then the approximation is equal to what?

A piece of iron wire weighs 2.225g. It is dissolved in acid, which oxidizes the iron to iron(II), and made up to 250 mL. A 25mL sample required 31.0 mL of a 0.0185mol/L solution of potassium dichromate. Calculate the percentage of iron in the wire.

121. ## math

what is 10^5-10^6 is it 10^11

122. ## calculus

using the fundamental theorem of calculus what is the derivative of the definite integral from x^3 to sqrt x of (sqrt t) sin t dt

123. ## math

when simipliified (2x10^3)(3x10^4)is equivalent 6x10^7

124. ## Math

The vector a1=(1,1,0) and a2=(1,1,1) span plane in R^3. Find the projection matrix P onto the plane, and find nonzero vector b that is projected to zero.

125. ## maths

AB=5cm , Angel B= 60 degree , Altitude cd= 4cm (Circle)

126. ## Math Algebra

Fit (2, 2), (6, 10), (10, 12), (16, 2) by a quadratic function (a2x2+ a1x+ a0=0).

127. ## math

what is the inverse function of f(x)=3/x-4

128. ## physics

in a rocket launching, the height h meter, the rocket reaches after t sec for the moment it was launched is given by h=xt-yt the rocket altitude after 2 sec is 40 metres, and after 3 sec is 45 metres. a. find x and y b. altitude rocket after 5 sec

129. ## Math ?

Pleas Help! I need to finish my project but I don't understand what there asking regarding a jacuzzi. I think measurements is needed for a cyclinder shape at the 3ft deep with people sitting, six people seating 2"wide, volume of water is 150 cubic ft

130. ## science

Helium has the lowest boiling point of the elements. The slightest change in temp can cause it to vaporize and expand. To prevent pressure explosions, a line from the tank has a "burst disk" in case a of sudden pressure increse. then the diaphragm would

131. ## calculus ap

If g is a differentiable function such that g(x) is less than 0 for all real numbers x and if f'(x)=(x2-4)g(x), which of the following is true?

132. ## Physics

A 0.100 kg croquet ball makes an elastic head-on collision with a second ball initially at rest. The second ball moves off with half the original speed of the first ball. (a).what is the mass of the second ball? (b).What fraction of the original kinetic

133. ## Grammar

Where is the verb on my sentence? I thought it was EDUCATION IS, but I was wrong about that. Was my sentence properly written? Thank you in advance Education is (simple present tense) the success to my financial planning.

134. ## Math

integrate (sin^8 x - cos^8 x)/(1 - 2sin^2 x * cos^2 x) w.r.t. x

135. ## algebra 2

A commercial freight carrier is flying at a constant speed of 400mi/h and is traveling 4 mi east for every 3 mi north. A private plane is observed to be 210 mi due east to the commercial carrier, traveling 12 mi north for every for 5 mi west. a.If it is

136. ## physics

Sam dropped a stone from her bedroom window.How high is the window if the stone travels for 2 seconds?

137. ## Physics

A truck traveled along the National Highway from Calbayog to Oquendo which has a distance of 35 km. for 30 minutes. After delivering some materials, the driver rested for a while then drove back straight to Calbayog. The trip back took him 25 minutes. What

138. ## Chemistry

The solubility product of PbCl2 at 25 degrees celcius is 1.6x10-5 mol3.dm-9. What is the solubility of PbCl2?

x + -3 = 2

140. ## ap chemistry

pentane is burned completely in oxygen gas. what is the balanced equation?

141. ## calc

A kite 100 ft above the ground moves horizontally at a speed of 8 ft/s. At what rate is the angle of elevation between the string and the horizontal decreasing when 200 ft of string have been let out?

142. ## child daycare man.

you've developed a file in which you keep pictures of differnt color birds. one day you give the group of pictures to a preschooler and ask him to to separate the pictures by color-all red in one pile, all blue in an other pile, and so on. he should then

143. ## math

hi i made a typo in my last question can u please show me step by step how to simplify [(x^3/y^3) -1]/[(x^2/y^2)+(x/y)+1]

144. ## Physics

Rona is driving a car, she travels a 40-90 km/hr and accelerates at 2m/s. How long will take for her to stop the car?

145. ## Calc

Let f(x) be the function defined by f(x) = {x, x≤0 x+1, x>0 The value of the integral of x(f(x))dx from -2 to 1 =?

146. ## Chemistry

The solubility of Ag2S is 2.48x10^-15 mol/dm3. Calculate its solubility product.

147. ## Physical Science

I have a really good grade in this class and I need to keep it that way. I am only asking to have my answers checked. I would like to graduate with honors so please help if you can. 1. A car traveling along the highway needs a certain amount of force

148. ## child daycare man.

i have these question can you check my answers? 1-Which Of The Following Is An Obstacle To Learning For A Beginning Mover? A)Knowledge of what elements of the movement to focus on b) Chronic indifference characteristic between birth and age three c)

149. ## spanish unscramble words

i need help to unscrable this spanish words 1 rimacea 2 asiedm 3 lmossbio

150. ## Collective bargaining

unions lead to low worker turnover because

151. ## Accounting

Write a memorandum addressed to Irving Backbreaker, the CEO of Delorean Inc., a local carmaker, that addresses the issues you face with turning around Delorean Inc., which is on the brink of bankruptcy. Limit your discussion to identifying issues you see,

152. ## Algebra

The function f(x)=(250x)/(100-x) models the cost, f(x), in millions of dollars, to remove x% of a river's pollutants. Use this functions to solve: If the government commits \$750 million for this project, what percentage of the pollutants can be removed?

153. ## Math Algebra

Transform the basis {[1, 0, 1], [0, 1, 2], [2, 1, 0]} for R^3 into an orthonormal basis, using the Gram-Schmidt process.

154. ## unscramble spanish words

more spanish words to unscramble 4 ooddrme 5 dnirtocai 6 dlaagirun 7 glnae 8 cllciovans 9 gamerdaous

155. ## Calc

If, for all real number x, f(x) = g(x) + 5, then on any interval [a, b], what is the area of the region between the graphs of f and g?

156. ## Algebra

The function f(x)=(250x)/(100-x) models the cost, f(x), in millions of dollars, to remove x% of a river's pollutants. Use this functions to solve: If the government commits \$750 million for this project, what percentage of the pollutants can be removed?

3c+4=4c-17

158. ## Calc

The volume of the solid formed by revolving the region bounded by the graph of y = (x-3)² and the coordinate axes about the x-axis is given by what integral?

159. ## algebra

4(c - 3) = 4c + 8

160. ## science

Helium has the lowest boiling point of the elements. The slightest change in temp can cause it to vaporize and expand. To prevent pressure explosions, a line from the tank has a "burst disk" in case a of sudden pressure increse. then the diaphragm would

161. ## Chemistry

Determine the mass of phosphoric acid that can be produced by the reaction of 1 ton of phosphate rock, Ca(PO4)2, and sulfuric acid.

162. ## calc

can you just show me how to set this up? or a formula that could help? im confused. The length of a rectangle is increasing at 3 ft/min and the width is decreasing at 2 ft/min. When the length is 50 ft and the width is 20 ft, at what rate is the rectangle

163. ## Chemistry

Determine the mass of phosphoric acid that can be produced by the reaction of 1 ton of phosphate rock, Ca(PO4)2, and sulfuric acid.

164. ## Chemistry

Determine the mass of phosphoric acid that can be produced by the reaction of 1 ton of phosphate rock, Ca(PO4)2, and sulfuric acid.

165. ## Maths / Physics

A car is moving along a straight horizontal road at 82 km/h and rain is falling vertically downwards at 25 km/h. Find the velocity of the rain relative to the driver of the car.

166. ## algebra

Last year, there were 120 seniors in Limon High School. This year there are 145. What is the percent of increase? Round to the nearest percent.

167. ## law

What are some of the ways that organized crime impacts you and a community and/or city (of your choice) directly? (This element will account for 20% of your grade.) What are some of the ways that law enforcement agencies are working to reduce these types

168. ## law

Over the past decade, some countries have shown high crime rates while other countries have lower crime rates. For example, the lowest homicide rates in 2000 existed in Saudi-Arabia and Japan, while France and Germany had the highest homicide rates. Their

169. ## calculus

How many critical points are in the function: f(x)= (x+2)^5 * (x-3)^4 What is the most time-efficient way to do this?

OK so can u guys help me compare/contrast A Tale of Two Cities to A Christmas Carol by Charles Dickens.. like compare characters,plot,theme,or writing style.. so far I have got.... The most obvious similarity between A Tale of Two Cities and A Christmas

171. ## Math

The factors of x^3-4x^2-x+4 are?

172. ## Social Studies

What is the unscrambled word for nailsaiou it's a state

173. ## maths/ physics

An aircraft P flying at a constant height has a velocity of (300+j400)km/h. Another aircraft Q at the same height has a velocity of (200+j500) km/h. Determine a)the velocity of P in relation to Q. b) the velocity of Q in relation to P

174. ## algebra

a basketball player shoots 70% of freethrows he has a 1 an 1 what is the probability of him shooting o,1,2 points

3x + y = 6

176. ## eng 20 F

shakespeare intro pack

177. ## math/physics

During a race, one runner runs at a 6 min/mi pace and another runner runs at a 7 min/mi pace. The fast runner passes the slow runner. After a 2 second delay, the slow runner initiates an acceleration, catching up with the fast runner in 968 feet. Give this

178. ## algebra

2x + y = 9 for y

179. ## algebra

2a = 3a + 4c for a

180. ## math

round 8,672 to then nearest ten

181. ## English

I would be very greatefull if anyone correct the following sentences, if they are not in right contexts. intermittent: 1. I don't know why john attends the classes intermittently. 2. the manager intermittent reviews have not effect on the staff and

182. ## Economics

How does the quantity and quality of a country's natural resources affect it's productivity?

183. ## physics

What linear speed must an Earth satellite have to be in a circular orbit at an altitude of 208 km above Earth's surface? (b) What is the period of revolution? I got a to be 7786 m/s^2 but im not sure how to get b.

184. ## Economics

What are several factors that affect the productivity of a worker?

185. ## Algebra

The Indians and Yankees are to face each other in a best two out of three playoff series. The probability of the Indians winning any given game is 0.3% A. what is the prob. that the Indians win the second game? B. What is the probability that the Indians

186. ## Economics

What impact has the development of machinery and automation had upon the labor force?

187. ## Algebra 1

How do I simplify 5(-c+3a)-c(2c+1)? Show the work not just the answer so I actually get how to do it please.

188. ## Economics

What are 2 disadvantages of being an unskilled worker?

189. ## Chemistry

How many grams of NaOH will react completley with 100 mL of 1 m of HCL?

190. ## algebra

2a = 3a + 4c for a

191. ## Math

On a test whose distribution is approximately normal with a mean of 50 and a standard deviation of 10, the results for three students were reported as follows: Student Opie has a T-score of 60. Student Paul has a z-score of -1.00. Student Quincy has a

192. ## geometry

A circle with center at (2,0) and a radius of 4 is intersected by a line whose slope is 1 and whose y intercept is 2. Write the equation of the line and write the equation of the circle in standard form. i know that the center-radius form is (x-2)^2 +

193. ## English

Can you please check these sentences for me? 1)This afternoon my child went bobsleighing with his best friend. They had fun sleiding down the snow. 2)They tumbled (fell headlong) several times. They also went on a sort of plastic pan (with a long handle)

194. ## physical science

a force used to lift a 12-kilogram mass to a height fo 8 meters in 2 seconds does 1040 joules of work. how much force is used.

195. ## geometry

it possible to have a triangle whose lengths are 2 m, 6 m, and 11 m? Justify your answer.

196. ## geometry

The vertices of ABC are A(-8, 0), B(0, 0), and C(0, -4). If a circle is circumscribed around ABC, where would the center of the circle be located?

197. ## geometry

Curtis constructed a line segment from each vertex of a triangle that bisected each angle. At what point of concurrency did the lines meet?

198. ## physics

what is the maximum speed with which a 1050kg car can round a turn of radius 70 m on a flat road if the coefficient of friction between tires and road is .80? is this result independent of the mass of the car?

199. ## Finance

I've solved every problem in my assignment except for two. I only need one more to get the grade I'd like/need. I've been doing this one over and over, consistently getting wrong answers. I know the process of how to do it generally, but I feel I make

200. ## chemistry

Is a gaseous mixture able to contain isolated atoms and molecules, and if so, do the mixtures have to contain them?

Statement: Most compounds that produce this in aqueous solution are ionic. Does this statement refer to an acid or a base or both?

202. ## Algebra

The weather channel has predicted that there is a 70% chance of rain today and 20% chance of rain tomorrow. A. What is the probability it wont rain tomorrow? B. What is the probability it wont rain tomorrow given that it rained today?

203. ## calculus

i understand optimization but im stuck on this problem.. mrs.day is building a new deck. she has 580 square feet to enclose. if one side is bounded by a wall, find the minimum cost to build the deck if one pair of opposite sides cost \$12 per foot and

204. ## Physics

A box with a mass of 4.0kg is sitting on a plane angled at 60degrees above the horizontal. The coefficient of friction between the box and the plane is 0.3. What is the horizontally applied force necessary to stop the box from sliding down the ramp?

205. ## Social Studies

What Progressive did Taft achieve?

206. ## Math

Cone Problem Beginning with a circular piece of paper with a 4- inch radius, as shown in (a), cut out a sector with an arc of length x. Join the two radial edges of the remaining portion of the paper to form a cone with radius r and height h, as shown in

207. ## Calc

Let f(t) = 1/t for t>0. For what value of t is f ' (t) equal to the average rate of change of f on [a,b]?

208. ## geometry

The two diagonals of a rhombus are 16 inches and 12 inches long. What is the perimeter of the rhombus? Round to the nearest inch, if necessary. a. 28 in b. 40 in c. 56 in d. 66 in

209. ## Algebra

What is the solution set for 0.5x+7 less than 1.3x-8

210. ## Chemistry

The solubility product of Fe(OH)3 is 8.0x10^-40. Calculate its solubility at 35 degrees Celsius in a saturated solution.