# Questions Asked onMarch 31, 2013

1. ## math

Cece scored a 78 on her first math test. She scored an 84 on her second test. What is the percent increase, rounded to the nearest tenth, from Cece's first score to her second score?

2. ## Chemistry

the number of moles that contains 5.13x1022 atoms of manganese

3. ## math

Gary has 10 coins in his pocket. 2 quarters 5 dimes 3 nickels without looking, Gary pulls 1 coin from his pocket and puts it on a table. Then, he pulls one more coin from his pocket. What is the probability that the first coin is a dime and the second coin

4. ## analytical chemistry

the problem is find the pH of a solution prepared by dissolving all of the following in sufficient water to yield 1.00 L of solution :0.180 mole of chloroacetic acid (CICH2CO2H),0.020 mole ofCICH2CO2Na,0.080 mole HNO3, and 0.080 mole Ca(OH)2. Assume that

5. ## psychology

Is addiction (Drug) a disease or a choice and why? Could it be possible that both apply according to scientific evidence

6. ## math

Determine the equation of g(x) that results from translating the function f(x) = (x + 6)2 to the right 11 units.

7. ## algebra

Determine the equation of g(x) that results from translating the function f(x) = x^2 + 9 upward 11 units.

8. ## math

Select the x-coordinate of the vertex of the parabola defined by the function f(x) = -7x^2 + 3x + 1.

9. ## CHEMISTRYY!

Determine if HNO3 can dissolve in the following metal: 1) Write a balanced chemical reaction showing how the 2.09g Cu dissolves in HNO3. I had put down: Cu(s) + 4HNO3(aq) ——> Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) but it's wrong. 2) Determine the minimum

10. ## math

Consider the equations: f(X)= -6x-1 and g(x)=4x^2 Select the solution for (fg)(x).

11. ## math

the profit (p), in dollars, for a company is modeled by the function p(x) = -750x^2 + 15,000x, where x is the number of items produced. For which values of x will the company lose money?

12. ## math

Melissa earned a score of 75% on her first test. She wants to earn an 85% on her second test. What is the percent increase, rounded to the nearest whole number, from 75% to 85%?

13. ## Math: Solving Trig Equation

9tan (x) - 9 sec^2 (x)/ tan (x)

14. ## Biochemistry

Nicotine is a small molecule produced by the tobacco plant Nicotiana tabacum. Nicotine is produced by the plant to discourage herbivores. In low doses, such as those experienced by tobacco users, it is a stimulant that leads to mild euphoria. In high

15. ## math

factor completely if the polynomial is prime. state this 6a^6-24a^3b

16. ## math

the height of a triangle is 5 cm more than the length of the base. if the area of a triangle is 133 cm^2 find the hight nad length of the base

x^2-5

18. ## math

factor completely if the polinomial is prime state this x^2 + 6xy - 135y^2

19. ## engineering mathematics

if on an average vessel in every 10 wrecked.find the probability that out of 5 vessels expected to arrive at least 4 will arrive safetly?

20. ## LIFE ORIENTATION

IDENTIFY AND DESCRIBE 3 Environmental health hdzards that cause ill health and disasters within your community

21. ## Life Orientation

the is lot of drugs around my community so which 5 environmental problem can impact the community

asked by Rangwaga Poppy
22. ## physics

from what height must a heavy elastic ball be dropped on a floor ,so thatafter reboundingthrice it will reach a height of 16 m?take e=(0.5)

23. ## Chemistry

X^2+ + 2e- -> X(s) E=1.73V Y^2+ + 2e- -> Y(s) E=0.40v Which pair of species would react under standard conditions? X^2+ and Y^2+ X and Y^2+ X and Y X^2+ and Y Would it be X and Y because the E is positive?

24. ## Chemistry

Calculate the standard free-energy change for the following reaction at 25 C degrees. 2Au^3+(aq)+3Ni(s) 2Au(s)+3Ni^2+(aq) Ni2+(aq) + 2e¨C ¡ú Ni(s) E=¨C0.26 Au3+(aq) + 3e¨C ¡ú Au(s) E=+1.498 G= ? KJ Would it be G=1.758?

25. ## physics

Two objects with masses 4.90 and 2.10 hang 0.800 above the floor from the ends of a cord 7.20 long passing over a frictionless pulley. Both objects start from rest. Find the maximum height reached by the 2.10 object.

26. ## Physics

A body of mass 3 kg experiences a force F=(2i +2j) N. If its initial velocity v=( -8i + 4j) m/s, then the time at which it will have a velocity just along the y-axis is ? (The expressions contain vector notations above them)

27. ## finance

1. According to the doctrine of supply, the amount---------- will increase as the _____ increase. A. bought, cost B. supplied, price C. demanded, cheapness D. sold, demand

asked by Pedro Zabala

Here is the height, in inches, of 10 randomly selected members of the girls' dance team and 10 randomly selected of the girls' volleyball team Based on the interquartile ranges of the two sets of data, which is a reasonable conclusion concerning heights of

29. ## algebra

algebraic factorization' 1- 6(2a-3)(a+7)+18(2a-3)(3a+2) 2-(3x-1)^2 +5(1-3x)+3x(1-3x)^2

if f(x) = √x^2-1 and g(x)=√x-1, which expression represents f(x)/g(x) for x>1? a) 1/√x+1 b) √x-1 c) √x+1 d) √x

31. ## math question

sheila made the following statement: the range of f(x) = ax + b is the set of all numbers given that a and b are real numbers. which produces a counter example to her statement? a=0 b=0 a

32. ## math help

consider the equations: f(x)= -6x-1 and g(x)= 4x^2 select the solution for (fg)(x)

33. ## maths

Prove r*n∁r=n*(n-1)∁(r-1)

What are some global issues the U.S. is facing that I can write an argument about?

35. ## life orientation

identify and describe one environmental problem that causes ill health,accidents,crises,and disasters within your community

36. ## math help

5) Consider the equations: f(X)= -6x-1 and g(x)=4x^2 Select the solution for (f+g)(x). a) -6x -1 + 4x^2 b) -24x^3 - 4x^2 c) -24x^2 - 1 d) -6x - 1- 24x^2

37. ## math help

6) Select the x-coordinate of the vertex of the parabola defined by the function f(x) = -7x^2 + 3x + 1. a) - 7/3 b) 1 c) 3/14 d) - 3/7

38. ## eng1511

the sure solution to unemployment is a better quality of education?

39. ## jeff

reasons for the increase or dissipation of hurricane strength

40. ## Physics

A compound microscope has an objective lens with a focal length of 1.5 cm and an eye piece of focal length 5 cm. It is focused on an object which is at a distance of 1.8 cm. The length of the microscope for normal adjustment is ?

41. ## english

I decided to have a glass of water rather than order a pepsi.

42. ## Chemistry

Determine the value of the equilibrium constant,Kgoal , for the reaction N2(g)+O2(g)+H2(g) (1/2)N2H4(g) + NO2(g) Kgoal=? by making use of the following information: 1.N2(g)+O2(g)2NO(g), K1=4.1010x10^-31 2.N2(g)+2H2(g)N2H4(g), K2=7.40x10^-26

43. ## Fianacial management

with continuous compounding at 10 percent for 30 years, the future value of and initial investment of \$ 2000 is closest to

44. ## science

reasons for the increase or dissipation of hurricane strength

45. ## financial management

your are planning to retire in twenty years. you want to be able to draw your savings at the rate of \$10,000 per end of year. How much would you have to pay in equal annual deposits until retirement to meet your objectives. assume interest remain at 9%

46. ## SCI/241

Create a 9- to 12-slide Microsoft® PowerPoint® presentation that focuses on the use, benefits, and risks associated with dietary supplements. What are dietary supplements? · What are some benefits of taking dietary supplements? · What are some risks

Your credit card: a) Is a form of demand deposit b) Is a form of time deposit c) Is an asset d) Has all the functions of money So from my understanding, credit cards are not an asset, since they do not store value, can't be sold or given away. Hence they

48. ## chemistry (Pls Bob check for me)

0.5g of fuming h2s04 oleum is diluted with water. This solution is completely neutralized by 26.7ml of 0.4N naoh. Find the percentage of free so3 in the sample My calculation h2s04 = 98g/mol s03 = 80g/mol 98/2 = 49 80/2 = 40 26.7ml x 0.4n = 10.68ml -

49. ## physics

An MRT tunnel is 418m long. Calculate the time it will take the 108-m long train , travelling at 72km/h to pass completely through the tunnel, leaving your answer in seconds

50. ## Gr 10 science

I can't find a picture to build a model of calcium sulphate using styrofoam ball pls help

51. ## math

Jill bought a can of pop for .75 and jane bought a 6 pack.for 3.60 who got the best buy and why is it the best buy

52. ## engineering mechanics

from what height must a heavy elastic body be dropped on a floor so that after rebounding thrice it will reach a height of 16m?take e=0.5

53. ## science

why the tilt of axis causes summer to be warmer than winter in the northern hemisphere i put because the rays of the sun strike the northern hemisphere more directly in the summer. but it could also be because northern hemisphere is closer to the sun in

54. ## Astronomy

If a comet was at aphelion (furthest distance from the sun) in 1944 and will be at perihelion (closest point to the sun) in 2050, at a distance of 0.5 AU, what would it's aphelion distance be

55. ## math

Mr. Jacob is 55 years old and Tony is 7 years old. in how many years will mr. Jacob be 4 times as old as tony?

56. ## Astronomy

If a comet was at aphelion (furthest distance from the sun) in 1944 and will be at perihelion (closest point to the sun) in 2050, at a distance of 0.5 AU, what would it's aphelion distance be

57. ## math

at the local clothing store, 3 similar shirts and 4 similar jackets cost \$360 and 1 shirt and 3 jackets cost \$220. find the cost of each shirt.

58. ## Money and Banking

Canada's 5 largest investment banks are owned by Canada's largest banks. This is because: a) They are all ultimately owned by the taxpayer b) Investment banks must have bank depositor's cash to give them liquiditiy c) Ultimately, they are in the same kind

59. ## math

david and joseph have a total of 328 marbles. Mathew and david have 176 marbles. joseph has 5 times as many as Mathew. how many marbles does david have?

60. ## math

james brought a few hamsters. for each day after the first day of the week, the hamsters at 20 grams of food than the previous day. the hamsters grew fast, finishing 1260 grams of food in the first week. how much food did the hamsters eat on the first day?

61. ## math

Another: theta is a second quadrant angle in standard position and tan theta = - (sqrt5)/(2) . Find the exact value of cos theta. I assume I use the equation 1 / cos(theta)^2 = 1 + tan (theta)^2 However how does this work out algebraically?

62. ## science

when 1 gram of water evaporated the volume of the water vapor increases but the mass remains constant. why does the water remain constant i think because the number of atoms remain constant

63. ## science

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of

64. ## Math

Mary made two rectangular prims figures with four-1 inch cubes. Which statement is true about the volumes and surface areas of the two figures.( there is figure A and figure B made out of four cubes but in different position ) A. The surface areas of

65. ## math

at the local clothing store, 3 similar shirts and 4 similar jackets cost \$360 and 1 shirt and 3 jackets cost \$220. find the cost of each shirt.

66. ## math

david and joseph have a total of 328 marbles. Mathew and david have 176 marbles. joseph has 5 times as many as Mathew. how many marbles does david have?

67. ## math

james brought a few hamsters. for each day after the first day of the week, the hamsters at 20 grams of food than the previous day. the hamsters grew fast, finishing 1260 grams of food in the first week. how much food did the hamsters eat on the first day?

68. ## Chemistry

An aqueous solution containing 10.50 g of a compound in 100.0 ml of solution has an osmotic pressure of 0.0187 atm. at 25°C. What is the molecular weight of the compound?

69. ## Math

What is the answer to the equation (0.3.)²-(0.2)²•(0.5)?

70. ## science

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of

71. ## life orientation

discuss 5 ways in which the human or environmental problem impacts on the community

72. ## Probability

Let X be the number of successes in 25 independent trials with probability 1/10 of success in each trial. Let m be the most likely value of S. Find m.

73. ## chemistry

Could pentane be successfully separated from hexane by distillation? and could cyclohexane be successfully separated from benzene by distillation? explain?

74. ## Calculus

Determine the intervals on which the function is concave up and concave down f(theta) = 21theta + 21Sin^2(theta), [0,pi] I have tried to implicitly differentiate but I am getting nowhere,... can anyone please help?

75. ## Calculus

Determine the intervals on which the function is concave up and concave down f(x) = 17x^2 = x^4 by differentiating I get f'(x) = 34x+4x^3 and then I get lost. Can someone finish this up?

76. ## Statistics

Suppose the U.S. president wants an estimate of the proportion of the population who support his current policy toward revisions in the Social Security system. The president wants the estimate to be within 0.028 of the true proportion. Assume a 99 percent

77. ## Math

the mass of earth is 5.97 x 10^24 kilograms. The mass of the moon is 7.34 x 10^22 kilograms. Part A: What is the combined mass of earth and the moon? express your answer in scientific notation. Part B: How many times greater is the mass of earth than the

asked by Jayson Angole
78. ## math

A random digit dialing phone survey asked, how many of the last ten traffic lights you drove through were red. Of 880 respondents, 171 admitted at least one light had been red. What is likely direction of the bias: More or fewer than 171 really ran a red

79. ## Chemistry

Acetylene, C2H2, can be converted to ethane, C2H6, by a process known as hydrogenation. The reaction is: C2H2(g) + 2H2(g) === C2H6(g) Given the following, what is the Kp for the reaction? C2H2(g): 209.2 ΔG˚!@#\$%^&J/mol) H2(g): 0 ΔG˚!@#\$%^&J/mol)

80. ## math

knowing that 2(theta) can be written as theta + theta, find the expression for sin2(theta) and cos2(theta). Is it 2sin(theta)cos(theta)?

81. ## math

show that sin ((pi)/(3))+((pi)/(6)) = sin[pi/3] + sin[pi/6] is NOT a true statement.

82. ## math

Under what conditions will the statement sin(angle1 + angle2) = sin (angle1) + sin (angle2) be true?

83. ## Chemistry

What is the boiling point of a 25.20% (m/v) KNO3 solution ? (Kf of water = 1.86 0C/molal) (Kb of water = .52 0C/molal) (molar mass potassium nitrate = 101.10324 g/mole) The density of the solution is 1.09 g/ml What is the molarity of the solution? What is

84. ## math

With reference to the right triangle,, explain why the expressions y = sin x and y = cos ((pi/2) - (x)) give the same results for all the values of x. Discuss whether or not this same relationship exists for angles greater than (pi/2).

85. ## science

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of

86. ## Calculus

THANK YOU TUTORS SO MUCH FOR YOUR HELP Determine the intervals on which the function is concave up or concave down. I finally understand that when f'' is greater than 0 it means concave up. f(X) = 18x^2 + x^4 so I differentiate that to be 36x + 4x^3 that

87. ## Math

Consider the equation below. 1/5(x+2)+2x = 6x-10 Part A: Which property can be used to simplify the expression 1/5(x+2)? Answer _______________ Part B: Move all x-terms to one side of the equation and simplify. Show your work. Answer _______________ Part

asked by Jayson Angole
88. ## math

david and joseph have a total of 328 marbles. Mathew and david have 176 marbles. joseph has 5 times as many as Mathew. how many marbles does david have?

89. ## math

random sample of 9600 students. 46% had at least one parent who was a college graduate. Estimate with 99% confidence the proportion of all students who had at least one parent who was a college grad. b) Sample does not include drop outs so estimate is

90. ## Physics

A purple beam is hinged to a wall to hold up a blue sign. The beam has a mass of mb = 6.1 kg and the sign has a mass of ms = 16.4 kg. The length of the beam is L = 2.83 m. The sign is attached at the very end of the beam, but the horizontal wire holding up

91. ## Algebra

Use the rational zeros theorem to list the potential reational zeros of the polynomial function. Do not attempt to find the zeros. f(x)=6x^4+9x^3+30x^2+63x+28

92. ## calculus

A potter forms a piece of clay into a right circular cylinder. As she rolls it, the height h of the cylinder increases and the radius r decreases. Assume that no clay is lost in the process. Suppose the height of the cylinder is increasing by 0.5

93. ## math

suppose 4.385 is placed in a savings account for 4 years . find the simple interest if the interest rate is 3.85%

94. ## Calculus

The continuity of floor functions the function: x - floor(x) it is continuous on what interval? i got all real numbers except for integers. is this right. thank you.

95. ## maths

Ted and Suzanne load 3476 songs into a player that randomly selects which song to play. When in random-selection mode, 22 of the first 30 songs were loaded by Suzanne. T and S want to determine if each have loaded a different proportion of songs. Let p

96. ## Calculus-Inverse Functions

is the inverse function of x+ floor(x) equal to x - floor (x/2) i got this after plotting points but i'm not sure. thank you

97. ## math

sue an shovel snow from her driveway in 55 minutes. Bill can do the same job in 60 minutes. how long would it take if they did it together.

98. ## math

the speed of train A is 14 mph slower than train B. Train A travels 190 miles in the same time it takes train B to travel 260 miles. What is the speed of each train?

99. ## math

a student traveled 230 km in 12days.At the same ratio, how far would the student travel in 36 days?

100. ## calc

find the limit:x->3 ln(x/3)/x^2-9

101. ## Math

In a group of 37 children, 14 had a dog, 20 had a cat, and 12 had both a dog and a cat. How many children had neither a dog nor a cat as a pet? 23 8 35 15 Is the answer 15? I think it is 15

102. ## science

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of

103. ## Math

Two dice are rolled. Find the probability of getting a 5 on either die or the sum of both dice is 5

asked by Char Jay
104. ## college math

An initial investment of \$1000 is appreciated for 4 years in an account that earns 6% interest, 2) compounded semiannually. Find the amount of money in the account at the end of the period.

105. ## Math

What is the perimeter of a trapeziod with an area of 96

106. ## computer programming

I need help with this problem please: Create the logic for a program that accepts input values for the projected cost of a vacation and the number of month until vacation. Pass both values to a method that displays the amount you must save per month to

107. ## Chemistry

What is the pH of 125 mL of a 1.59 M solution of a monoprotic weak acid, HA (Ka=9.53×10–5), after 29 mL of 0.37 M NaOH is added? I have no Idea how to start this problem and the homework is due tonight, could someone please help me in calculating this?

108. ## Chemistry

What are the concentrations of A– and HA after 24 mL of 0.33 M hydrochloric acid solution is added to 86 mL of a solution that has [A– ]=0.67 M? Do NOT consider any equilibrium reactions in this problem. A–(aq) + HCl(aq) → HA(aq) + Cl–(aq) How do

109. ## Math

Upon examining the contents of 38 backpacks, it was found that 23 contained a black pen, 27 contained a blue pen, and 21 contained a pencil, 15 contained both a black pen and a blue pen, 12 contained both a black pen and a pencil, 18 contained both a blue

110. ## SCIENCE 8R - HELP!

...G.....g G..GG...Gg g..Gg...gg G - Blue g - Black G - Dominant g - recessive Homozygous - ????????? Heterozygous - ??????? Please help ..... I need to find the percentage of Homozygous and Heterozygous and find which on is Homozygous and Heterozygous! (I

111. ## math

Find the absolute extrema of the function on the closed interval. Use a graphing utility to verify your results. (Round your answers to two decimal places. If an answer does not exist, enter DNE.) g(x) = (x^2 − 4)^2/3, [−5, 3]

112. ## math calculus

Find the absolute extrema of the function on the closed interval. Use a graphing utility to verify your results. (Round your answers to two decimal places. If an answer does not exist, enter DNE.) g(x) = (x^2 − 4)^2/3, [−5, 3] find absolute maximum (x,

113. ## biology

Consider the pedigree below. Individual 1 is homozygous normal. Individual 2 is both red-green color blind and a hemophiliac. Individual 6 is the as yet unborn son of 4 and 5. What is the probability that their son, 6, will be both color blind and a

114. ## Bio Help Please!!!

1)How can you indicate that the bacteria have taken up the plasmid? 2)What is the purpose of the LB/amp(-) plate? Should there be bacterial growth on the plate? 3) Why would one compare plates LB/amp (-) and LB/amp (+)?

115. ## Physics 11

Two people start running from rest. The first person has a mass of 59 kg and is wearing dress shoes with a coefficient of static friction of 0.52. The other person is wearing running shoes with a coefficient of static friction of 0.66. Explain why we do

116. ## math

A firm issues bonds with a face value of 1000, a coupon rate of 7% and that will mature in 10 years and the market yield is 10% and pay interest semiannually what is the value. Please help

117. ## POL

Policy making in the United States is made through incrementalism because (Points : 1) the Constitution prohibits grand sweeping steps. the Madisonian system prevents grand sweeping action. incrementalism is more efficient. incrementalism produces the best

118. ## POL

The process of representation through consensus building can best be characterized as (Points : 1) taking bold legislative action. partisan mutual adjustment. incrementalism. political grandstanding.

119. ## Algebra

A baseball player hits a baseball into the air with an initial vertical velocity of 48 feet per second from a height of 3 feet. 8. Write an equation that gives the baseball’s height as a function of the time (in seconds) after it is hit. 9. After how

120. ## research

I am doing a Psychology research paper. I wrote the sources I used but my teacher says I need 3 primary sources. Im not sure what he means. Please help me understand

121. ## statistics

In a carnival game, a player spins a wheel that stops with the pointer on one (and only one) of three colors. The likelihood of the pointer landing on each color is as follows: 65 percent BLUE, 22 percent RED, and 13 percent GREEN. Note: Your answers

122. ## Math- Ms Sue can you help

Here is the height, in inches, of 10 randomly selected members of the girls' dance team and 10 randomly selected of the girls' volleyball team Based on the interquartile ranges of the two sets of data, which is a reasonable conclusion concerning heights of

123. ## PHYSICS'S

How much heat would it take to change 1.0kg of water at 20°C to steam at 110°C. I can't get the right answer that is 2.6×10^6J. Please tell me how can I solve this problem, I want to learn how to solve These problem plz help me.

124. ## stats

In a transportation study of 20 large cities, it was found that the mean of the number of cars per person was 0.504. (Some of the people in the city are children.) The study also stated that the standard deviation s was 0.123. Find a 95 % confidence

125. ## stats

The standard deviations s for the annual medical costs 30 heart disease patients was found to equal \$1005. Find a 95 % confidence interval for the standard deviation of the annual medical costs for all heart disease patients.

126. ## Chemistry

Consider the decomposition of barium carbonate: BaCO3(s)= BaO(s) + CO2(g). Using data from Appendix C in the textbook, calculate the equilibrium pressure of CO2 at 298K.

127. ## Chemistry

The temperature of oxygen is 810 torr at 298 K , what will the pressure be at 330 K? Using Lussac's Law, would the answer be 896.98 torr? Thanks

128. ## math

solve by factoring and using principle of zero product 2k^2=27k-81

129. ## Use the rational zeros theorem

Use the rational zeros theorem to list the potential reational zeros of the polynomial function. Do not attempt to find the zeros. f(x)=6x^4+9x^3+30x^2+63x+28

130. ## Repost- Already Solved-Calculus

is the inverse function of x+ floor(x) equal to x - floor (x/2) i got this after plotting points but i'm not sure. thank you Thank you 'gain!

131. ## Math

Need help on the question below. Bill exercises daily by walking on a treadmill. He sets the machine so that he will walk at a rate of 3.6 miles per hour. T = time in hours; D = distance in miles. What are the independent and dependent variables? Thanks..

132. ## Algebra

what is the domain of the relation {(1,4),(2,5),(3,6),(2,2),(1,1)}? A. {1,2,3} B. {1,2,3,4,5,6} C. All whole numbers except 0 D. All real numbers between 1 and 6 inclusive

133. ## Simple Math

Please help me with this problem . It is not hard but I need some help . In a clinical trial, a drug used to relieve pain caused side effects in 9% of the patients who took it. For a new trial, two patients were selected at random. Find the probability

134. ## Chemistry

When titrating a weak base with a strong acid, what effect will washing the tip of the burette and sides of the beaker with distilled water have on the pKa and equivalence points?

135. ## Chemistry

When titrating a weak base with a strong acid, what effect will washing the tip of the burette and sides of the beaker with distilled water have on the pKa and equivalence points?

136. ## programming

Input a list of positive numbers (terminated by 0) into an array, find the mean (average) of the numbers in the array, and output the results. Use a subprogram to input the numbers, a function to find the mean, and a subprogram to output the result.

137. ## math

help fact the trinomial completely and show how it was done. 12x^3 - 52x^2 -40x

138. ## physics

A flat screen is located 0.43 m away from a single slit. Light with a wavelength of 530 nm (in vacuum) shines through the slit and produces a diffraction pattern. The width of the central bright fringe on the screen is 0.058 m. What is the width of the

139. ## Algebra

Use the intermediate theorem to show that the polynomial function value has a zero in the given interval f(x)=x^5-x^4+8x^3-7x^2-17x+7; [1.6,1.8] Find the value of f(1.6) Find the value of f(1.8)

140. ## physics

Two racquetballs, each having a mass of 200 g, are placed in a glass jar as shown in in the figure below. Their centers lie on a straight line that makes a 45° angle with the horizontal.

141. ## Physics

How much work is done by the horizontal force F = 150 N on the 18 Kg block when the force pushes the block 5.0 M up along the 32 degree friction-less incline?

142. ## chem

Which of the following could be added to a solution of sodium acetate to produce a buffer? ? A) acetic acid only B) acetic acid or hydrochloric acid C) potassium acetate only D) sodium chloride or potassium acetate E) hydrochloric acid only i knowt he

143. ## Algebra Recursive sequence help

I need some help as I'm totally lost! I need to find the first five terms of each recursive sequence. The n-1 on the problem shows it below the a. 1. A1=3 An=2a n-1- 3 2. C1=64, C2=32 Cn= Cn-2 - Cn-1/2

144. ## math

With reference to the right triangle,, explain why the expressions y = sin x and y = cos ((pi/2) - (x)) give the same results for all the values of x. Discuss whether or not this same relationship exists for angles greater than (pi/2).

145. ## math

Hi ! Here is my question: The pythagorean theorem gives the relationships between the sides of a right triangle. The following identities show the relationships between the trigonometric functions of a particular angle. sin^2(theta) + cos^2(theta) = 1

146. ## physics

A 3.56-kg rock is released from rest at a height of 15.2 m. Ignore air resistance and determine (a) the kinetic energy at 15.2 m, (b) the gravitational potential energy at 15.2 m, (c) the total mechanical energy at 15.2 m, (d) the kinetic energy at 0 m,

4p^2+8p+1=0

148. ## chemistry

Calculate the increase of entropy in J/K when 8.6 mole of C 2 H 5 OH melts at (-114) o C and 1 atm. ΔH fus = 5.02 kJ/mol

149. ## algebra

You throw a tennis ball up in the air from an initial height of 4 feet and an initial velocity of 36 feet per second. Will the ball reach a height of 30 feet? If so, how long will it take?

150. ## chemistry

would 20.0g of steam at 100 degreeC. be enough to melt 20.0g of ice at 0 degreeC

151. ## algebra

y= -x^2-12x+28 A painter can use the formula A=2/3bh to estimate the area of space under the parabola. Calculate area in square ft under each arch ~ if there are 8 arches to be painted how many square ft must be painted ~ if 1 gallon paints 200 square ft ,

152. ## Algebra

If 3a-b+12=0 and 4a-3=2b what is the value of b?

153. ## Physics

You are riding in a school bus. As the bus rounds a flat curve at constant speed, a lunch box with a mass of 0.550 suspended from the ceiling of the bus by a string of length 1.77 is found to hang at rest relative to the bus when the string makes an angle

asked by Sydney Wajcman
154. ## Calculus

find the 6th degree Taylor polynomial for f(x)=cosx centered at pi/2

155. ## math research

on the 15 march otaki river recorded a flow (cumecs) of 5.7 metres. this time last year it was 19.3 metres. how many metres difference is that to the nearest metre?

156. ## physics

At a nuclear power plant water at 8°c from a lake is used in a heat exchanger to condense spent steam at a temperature of 120°c,to water at 85°c before it is recycled to the reactor. If the cooling water returns to the lake at a temperature of 19°c,how

157. ## bus235

An economics student would like to buy a mini-scooter, but she cannot afford one. Which of the following reasons explain why marketing fails to occur here?

asked by Ashford University
158. ## Math

a farmer wants to enclose a rectangular field he needs to put fence posts every 10 ft. how many posts will he need for 200 ft of fencing

159. ## physics

At a nuclear power plant water at 8°c from a lake is used in a heat exchanger to condense spent steam at a temperature of 120°c,to water at 85°c before it is recycled to the reactor. If the cooling water returns to the lake at a temperature of 19°c,how

160. ## math

on the 15 march otaki river recorded a flow (cumecs) of 5.7 metres. this time last year it was 19.3 metres. how many metres difference is that to the nearest metre?

161. ## Mathematics

Please help me !!!!!!!!!!!!!! a farmer wants to enclose a rectangular field he needs to put fence posts every 10 ft. how many posts will he need for 200 ft of fencing

162. ## biology

how do chromosomes move inside a cell during each stage of cell division?

163. ## Chemistry

Calculate the molar mass of a diprotic acid. The reaction reaches the endpoint of the titration with NaOH at 28ml. The initial concentration of NaOH is 0.09792. and the initial mass of the diprotic acid is 0.685g. How do you get to the final answer? All of

164. ## calculus

find the first derivative: 4xsqrt2x^2+2x-1.

165. ## Application: Two-Sample t-Tests

Should Martha use an independent-samples t-test or a related samples t-test? Explain your answer.

166. ## physics

A railroad car with a mass of 2.35 × 104 kg moving at 3.90 m/s collides and joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.25 m/s. a) What is the final speed

167. ## Trig

Verify that each trigometric equation is an identity. 1/1-sinx + 1/1+sinx = 2 sec^2x

what are some arguments that could be made on child obesity

169. ## Chemistry

Calculate the grams of oxygen gas present in 2.5 L sample kept at 1.66 atm pressure and a temperature of 10 C. - I got 5.72 grams Determine the volume of oxygen gas needed to completely combust 0.202 L of Butane(C4H10). -I got 1.31 L O2. -Thanks

170. ## Math

Can I please get help on the questions for 'What do you get if a bunch of bad guys fall in the ocean?' on page E-53? Please help, been on this for about 3 hours already!

171. ## PHYSICS

1kg of fat is equal to 30MJ of energy.the efficiceny of converting fat to energy is 20%. suppose you life a mass of 12kg 2.0m vertically,500 times, how much work do you do?

172. ## Managerial Accounting

If given the Selling price, the direct labor costs and other variable costs how do you determine the number of direct labor hours per unit?

173. ## physics

A passenger on a boat moving at 1.70 m/s on a still lake walks up a flight of stairs at a speed of 0.60 m/s. The stairs are angled at 45° pointing in the direction of motion as shown in figure below. Write the vector velocity of the passenger relative to

174. ## Science Check Answer

5. Acceleration is a change in position and speed. True or false I think False

175. ## Statistics Help Please

The following data were collected on non-conformances for a period of 10 days. Day Sample Size Non-conformances 1 100 12 2 100 14 3 100 10 4 100 18 5 100 22 6 100 14 7 100 15 8 100 13 9 100 14 10 100 16 On what day is the proportion of non-conformances

176. ## PHYSICS

At a nuclear power plant water at 8°c from a lake is used in a heat exchanger to condense spent steam at a temperature of 120°c,to water at 85°c before it is recycled to the reactor. If the cooling water returns to the lake at a temperature of 19°c,how

177. ## Math

Evaluate 2y^2(x+y) when x=1 and y=7

178. ## stats

n a transportation study of 20 large cities, it was found that the mean of the number of cars per person was 0.504. (Some of the people in the city are children.) The study also stated that the standard deviation s was 0.123. Find a 95 % confidence

179. ## calculus

4x√(2x^2 + 2x - 1). find first derivative

180. ## Chemistry

A sealed flask contains 1 mole of hydrogen and 3 moles of helium gas at 20DC. If the total pressure is 40kPa, what is the partial pressure of the Hydrogen gas? AND :) The data below was obtained by a student in order to determine the percent of water in a

181. ## Physics

A combination lock has a 1.2 cm -diameter knob that is part of the dial you turn to unlock the lock. To turn that knob, you grip it between your thumb and forefinger with a force of 0.62 N as you twist your wrist. Suppose the coefficient of static friction

182. ## Algebra

Using the substitution method, what is the value of a in the solution to the system of equations below? a=3b+7 4a+9b=70

183. ## Algebra

A company has two printers. Printer A prints a pages per minute, and Printer B prints b pages per minute. When Printer A prints for 3 minutes and Printer B prints 5 minutes, a total of 70 pages are printed. When Printer A prints for 6 minutes and Printer B

184. ## physics

solid sphere of uniform density starts from rest and rolls without slipping down an inclined plane with angle è = 30o. The sphere has mass M = 8 kg and radius R = 0.19 m . The coefficient of static friction between the sphere and the plane is ì = 0.64.

185. ## Calculus

does the sum e^n / n! converge or diverge? n=1 --> infinity

186. ## Calculus

does the series 1/(n^2+n) converge or diverge? n=2 to n=infinity

187. ## Mechanics

Two objects with masses 5.60 and 2.40 hang 0.600m above the floor from the ends of a cord 8.00m long passing over a frictionless pulley. Both objects start from rest.Find the maximum height reached by the 2.40kg object

188. ## managerial acct

Need help with this problem. Please show me how to work this one: The level of inventory of a manufactured product has increased by 8,000 units during a period. The following data are also available Unit manufacturing costs of the period: Variable: \$24

189. ## PHYSICS help please!!!!!!!!!!

At a nuclear power plant water at 8°c from a lake is used in a heat exchanger to condense spent steam at a temperature of 120°c,to water at 85°c before it is recycled to the reactor. If the cooling water returns to the lake at a temperature of 19°c,how