# Questions Asked onApril 9, 2012

1. ## chemistry

Find the pH during the titration of a 20.00mL of 0.1000 M butanoic acid, CH3CH2CH2COOH (Ka=1.54 x10^-5), with the addition of 10 mL of 0.1000 M NaOH solution??

2. ## physics

An 8.00kg package in a mail-sorting room slides 2.00 m down a chute that is inclined at 53.0 degrees below the horizontal. The coefficient of kinetic friction between the package and the chute's surface is 0.400. Calculate the work done on the package by

3. ## Math

The quantity demanded each month of russo Espresso Makers is 250 when the unit price is \$140; the quantity demanded each month is 1000 when th e unit price is \$110. the suppliers will market 750 expresso makers if the unit price is \$60 or higher. At a unit

4. ## Physics Need Help PLEASE

Two point charges are separated by 8 cm. The attractive force between them is 14 N. If the two charges attracting each other have equal magnitude, what is the magnitude of each charge?

5. ## Chemistry

What NaCl concentration results when 209 mL of an 0.660 M NaCl solution is mixed with 492 mL of a 0.270 M NaCl solution? __ mol/.209 L = 0.660 M __ mol/.492 L = 0.270 M .. I have no idea how to solve this. I have no idea why I even set up the equation

6. ## math

You are paid \$8.55/hr at your part-time job. You work 10 hours per week. You are considering working a part-time job for \$6.25/hr, and it pays tips. You will earn an average of \$3.00/hr in tips. If you work the same 10 hours at the new job, how much more

7. ## Chemistry

Calculate the solubility of cadmium sulfide, CdS, in mol/L, given the Ksp value as 8.0 x 10^-27.

8. ## Pre-calc

An investment firm has a job opening with a salary o \$30,000 for the first year. Suppose that during the next 39 years, there is a 5% raise each year. Find the total compensation over the 40-year period.

9. ## AlgebraII

A bag contains 5 pictures of Paris and 7 pictures of London. Determine whether the events of selecting the picture of London and another picture of London with replacement is independent or dependent. Then identify the indicated probability.

10. ## Statistics

Suppose that the scores of architects on a particular creativity test are normally distributed. Using a normal curve table, what percentage of architects have Z scores (a) above .10, (b) below .10, (c) above .20, (d) below .20, (e) above 1.10, (f) below

11. ## Pre Cal

An airplane leaves an airport and flies due west 150 miles and then 230 miles in the direction S 39.67 degrees W. How far is the plane from the airport at this time to the nearest mile.

. Ksp for Fe(IO3)3 is 10-14. Two solutions, one being iron(III) nitrate and the other being sodium iodate, were mixed. At the instant of mixing, [Fe3+] = 10-4M and [IO3-] = 10-5M. What happens? My answer is that a precipitate forms because Qsp > Ksp. Would

13. ## chemistry

Which of the following measures thermal energy in an object? (Points : 4) temperature mass heat volume

14. ## physics

A 55.0 g ice cube, initially at 0°C, is dropped into a Styrofoam cup containing 318 g of water, initially at 18.2°C. What is the final temperature of the water, if no heat is transferred to the Styrofoam or the surroundings?

15. ## math

please help! You are paid \$7.45/hr at your part-time job. Your deductions are FICA (7.65%), federal tax withholding (10.65%), and state tax withholding (5.7%). Your travel expenses are \$5.70 per day worked. You work 12 hours over a 3-day period of time.

16. ## physics

.Two automobiles are equipped with the same single-frequency horn. When one is at rest and the other is moving toward an observer at 14 m/s, a beat frequency of 5.1 Hz is heard. What is the frequency the horns emit? Assume T = 20°C.

17. ## Physics

In a hydraulic lift, the radii of the pistons are 2.93 cm and 10.1 cm. A car weighing W = 11.0 kN is to be lifted by the force of the large piston. (a) What force Fa must be applied to the small piston? N (b) When the small piston is pushed in by 10.4 cm,

18. ## Calculus

If m ≤ f(x) ≤ M for a ≤ x ≤ b, where m is the absolute minimum and M is the absolute maximum of f on the interval [a, b], then m(b − a) ≤ b f(x) dx a≤ M(b − a). Use this property to estimate the value of the integral. The integral from 0 to

19. ## physics

The sun is 1.5 1011 m from the earth. (a) Over what surface area is solar radiation spread at this distance? (b) What is the total power radiated by the sun? (The sun delivers energy to the surface of the earth at a rate of approximately 1400 W/m2.) (c)

20. ## chemistry

What is the molar solubility of lead(II) chromate (ksp=1.8x10^-14) in 0.13 M potassium chromate?

21. ## Consumer math

When Greg was born, his grandmother put \$5000 in a savings account for his college expenses. It was compounded at 2.5 percent semiannually, and left in the account 18 years. How much was in the account? Round to the nearest dollar.

22. ## Chemistry- Acids and Buffers

Cyanic Acid is a weak acid HOCN + H2O H3O+ +OCN- ka= 3.5*10^-4 a) if 2.5ml of 0.01 M cyanic acid solution is added to 25.0 ml of a formis acid buffer with ph = 3.70, what is the ratio of [OCN-]/[HOCN] in the resulting solution? b) determine the pH of a

23. ## Chemistry

A reaction yields 3.75 L of nitrogen monoxide. The Volume is measured at 19 *C and a pressure of 1.10 atm. What mass of NO was produced by the reaction?

24. ## chemistry

The rusting of iron is represented by the equation 4Fe + 3O2 2Fe2O3. If you have a 1.75-mol sample of iron, how many moles of Fe2O3 will there be after the iron has rusted completely?

25. ## physics

What is the momentum of a two-particle sys- tem composed of a 1300 kg car moving east at 100 m/s and a second 1300 kg car mov- ing west at 35 m/s? Let east be the positive direction. Answer in units of kg · m/s

26. ## Chemistry

SO this is my first time doing this... lol i need help on an AP chemistry question for equilibrium. A 0.500 L tank contains 3.00 g of NO(g) at 750. K. The equilibrium constant for the reaction below at this temperature is 3.4 x 10 -3 2NO(g) ⇌ N2(g) +

27. ## geometry

Find the volume of a rectangular prism whose dimensions are twice those of another rectangular prism that has a volume of 120 cm3

28. ## physics

What is the momentum of a two-particle sys- tem composed of a 1300 kg car moving east at 100 m/s and a second 1300 kg car mov- ing west at 35 m/s? Let east be the positive direction. Answer in units of kg · m/s

29. ## Physics

A bullet mass 10 g strikes a log with a mass of 25 g suspended from a 3 meter long string. The bullet lodges in the log which swings up through an angle of 30 degrees. Find the speed of the bullet just before it hit the log.

30. ## environmental; science

describe three or more of the six major ways in which humans use land.

31. ## Chemistry

Need help with AP chemistry, specifically Acids and Bases The acid ionization constant, Ka, for propanoic acid, C2H5COOH, is 1.3  10 -5 . (a) Write the expression for the acid-dissociation constant, Ka for propanoic acid. (b) Calculate the hydrogen ion

32. ## math

A container in the shape of a right circular cylinder with no top has surface area 3*pi (m2). What height h and base radius r will maximize the volume of the cylinder ?

33. ## Pre Cal

Two tracking stations are on the equator 158 miles apart. A weather balloon is located on a bearing of N 41degrees E from the western station and on a bearing of N 21degrees E from the eastern station. How far is the balloon from the western station.

34. ## physics

A wagon is used to help deliver papers. There is a force applied at an angle of 25 degrees to the horizontal that causes the wagon to move a distance of 15m[N] in 10.0s from rest. There is a force of friction of 3.1 N acting on the 27kg wagon. What is the

35. ## Math

Figure out a persons BMI with the formula B= 703w/h^2

36. ## science

a wolf is chasing a rabbit. Use the following data to graph the wolf's motion 15 m/s at 0s, 10 m/s at 1s, 5 m/s at 2s, 2.5 m/s at 3s, 1 m/s at 2s, 2.5 m/s at 3s, 1 m/s at 4s, and 0 m/s at 5 s. What does the graph tell you?

Point N is on hypotenuse BC of triangle ABC such than angle CAN is 45 degrees. If AC=8 and AB=6, find AN. I did Pythagorean Theorem for triangle ABC, and hypotenuse BC will be 10. I don't know how to continue from there. Oh, I'm also unsure about this, but

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38. ## Chemistry

A 10.00 g sample of He is compressed isothermally from a volume of 61.1 L to a volume 2.00 L at a temperature of 25 °C. Calculate the work done by the gas on the surroundings if the external pressure is 101.325 kPa.

39. ## Chemistry

Need help in AP chemistry on Equilibrium When heated, hydrogen sulfide gas decomposes according to the equation 2 H2S(g) ⇄ 2 H2(g) + S2(g) A 3.40 g sample of H2S(g) is introduced into an evacuated rigid 1.25 L container. The sealed container is heated to

How much does it cost to operate a 100 W lamp continuously for 1 week if the power utility rate is 8/kWh? answer in \$

41. ## Math

10e^(3x-7)= 5 So what I've done is rewritten it as: (3x-7)ln10e = ln5 Now I'm a little lost as to what to do next...

42. ## 6th G-Math

1.What is a reasonable estimate for the area of a circle with radius 4 cm? A. Area=12cm^2 B. Area=16cm^2 C. Area=24cm^2 D. Area=48cm^2

43. ## College Physics

A 1.70 kg object attached to a spring moves without friction and is driven by an external force given by F = (3.00 N) sin(2πt). (a) If the force constant of the spring is 20.0 N/m, determine the period. _____s For this one I tried 2*pi*sqrt(1.7/20) but it

44. ## scientist

What is biomass energy? the chemical energy stored in living things the electromagnetic energy stored in living things the nuclear energy stored in living things the thermal energy stored in living things Not sure what this one could be

45. ## Chemistry

Titanium (6.94x10^-19) and silicon (7.77x10^-19) surfaces as irradiated with UV radiation with a wavelength of 231 nm. what is the wavelength of the electrons emitted by the titration surface?

46. ## scientist

Solar cells convert what type of energy into electrical energy? chemical electromagnetic nuclear thermal Can someone please help I believe thermal

47. ## phys chem

Calculate the Coulomb potential due to the nuclei at a point in a LiH molecule located 200 pm from the Li nucleus and 150 pm from the H nucleus. just doing exam review and got stuck on just this one, be great if I could get an answer.

48. ## Chemistry

Hemoglobin, an oxygen-carrying protein in blood, contains 4 iron atoms per molecule and the iron comprises 0.34% of the molecules mass. What is the molecular weight of hemoglobin? Thanks!

Rebecca wondered if the type of papre used to make a paper airplane would affect the distance the plane flew.She hypothesized that an airplane made of light weight paper would fly farther than an airplane made of heavier paper.Rebecca made 5 airplanes.They

In a certain process 500 cal of heat is given to a system and the system does 100J of work. What will be the increase in internal energy of the system?

51. ## Chemistry

what is the molar solubility of lead(II) chromate (ksp=1.8x10^-14) in 0.13 M potassium chromate?

52. ## Finance

Jungle, Inc. has a target debt-equity ratio of 0.72. Its WACC is 11.5 percent and the tax rate is 34 percent. What is the cost of equity if the aftertax cost of debt is 5.5 percent?

53. ## chemisry.Electrochemical Measurement of Concentrat

A calibration curve to show how the cell potential varies with [Cu2+] may be constructed. A plot of cell potential (in V, with the same sense as in question 1) versus log10[Cu2+] should yield a straight line. What is the slope of this line? The answer

54. ## Chemistry

Calculate ∆Hºf /mol for propane, C3H8(g), given the following reaction: (10 points) C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(ℓ ); ∆Hºrxn = -2219.9 kJ

55. ## Probability

A bag contains some balls of which 1/4 are red. Forty more balls of which 5 are red are added. If 1/5 of all the balls are red, how many balls was there originary?

56. ## Life orientation

define unfairractice or unethical practice of sportmen or homen and discuss 6 examples.

57. ## physics

A pot containing 1.09 liter of water, initially at 18°C, is placed on a 1101 W electric heating element. (a) How much heat must be supplied to the water to bring it to a boil? (b) How much heat is necessary to boil all the water away? What is the minimum

58. ## Statistics

I'm going over some practice problems and I can't seem to figure this one out. Can anybody give me some help please? On a measure of artistic ability, the mean for college students in New Zealand is 150 and the standard deviation is 25. Give the Z scores

59. ## Chemistry 2

The bottle of bleach lists the percentage of sodium hypochlorite as 6.0%. If the density of commercial bleach is 1.084 g/mL, how many mL of .150 M sodium thiosulfate is required to reach the endpoint in a titration if a student analyzed a 2.0 mL sample of

60. ## Physics

Elle is pushing a box of mass 7.0 kilograms with the force of 25 newtons. If the force of friction is 2.6 newtons, what is the value of acceleration of the box?

For an acetic acid-sodium acetate buffer to have a pH of 4.64, what molar ratio of CH3COOH to Na+ CH3COO– is needed? I know that the Ka value for acetic acid is 1.8e-5 and that I have to divide this value by the value of sodium acetate but I do not

62. ## Economics

Introduction to Economics: Explain why scarcity and choice are basic problems of economics?

63. ## chemistry

3Ag(s) + 4HNO3(AQ) = 3AGNO3(aq) + NO(g) + 2h2o(l) How many moles of NO can be produced by the reaction of 54.0g of Ag show me the step please

64. ## Physics

A monoatomic gas expands isobarically.What will be the percentage of heat supplied that increases the thermal energy and that involved in doing work for expansion?

The isothermal bulk modulus of elasticity of a gas is 1.5 * 100000 N/m^2. What will be its adiabatic bulk modulus of elasticity? Given the ratio of Cp/Cv=1.4

66. ## Finance 370

A bond that has a \$1000 par value (face value) and a contract or coupon interest rate of 11.5. The bonds have a current value of \$1120 and will mature in ten years. The firm's marginal tax rate is 34%. Using the time value of money, calculate the yield to

67. ## physics

A horizontal segment of pipe tapers from a cross sectional area of 50 cm2 to 0.5 cm2. The pressure at the larger end of the pipe is 1.26 105 Pa and the speed is 0.029 m/s. What is the pressure at the narrow end of the segment? Pa Please help!

68. ## physics

A horizontal water main with a cross-sectional area of 206 cm2 necks down to a pipe of area 42.4 cm2. Meters mounted in the flow on each side of the transition coupling show a change in gauge pressure of 71.0 kPa. Determine the flow rate through the

69. ## Finite Math

The quantity demanded each month of russo Espresso Makers is 250 when the unit price is \$140; the quantity demanded each month is 1000 when th e unit price is \$110. the suppliers will market 750 expresso makers if the unit price is \$60 or higher. At a unit

70. ## algebra

Jane spent 62% of her school budgets on books. In degrees what measurement would would that section be on a circle graph

In changing the state of a system from state A to state B adiabatically the work done on the system is 322 J. If 100 cal f heat are given to the system in bringing it from state A to state B, then what will be the work done on the system in this process?

72. ## handling and restraint-animals

I need help on this 1 question i have my answer, i just need to know whats the right answer.... The least desirable method of restraint for a cat is a.holding the cat while wearing heavy gloves. b.holding the cat with your bare hands. c.placing the cat in

73. ## math

The Downtown Theater has 1 ticket window. In how many ways can 3 people line up to buy tickets?

74. ## Math 1330

In a survey of 1000 eligible voters selected at random, it was found that 200 had a college degree. Additionally, it was found that 90% of those who had a college degree voted in the last presidential election, whereas 47% of the people who did not have a

75. ## Economics

Introduction to Economics: Explain why scarcity and choice are basic problems of economics?

76. ## math

5a + 2b is a a. monomial b. binomial c. trinomial what is a monomial? binomial? trinomial?

77. ## physics

In a hydraulic lift, the radii of the pistons are 2.93 cm and 10.1 cm. A car weighing W = 11.0 kN is to be lifted by the force of the large piston. (a) What force Fa must be applied to the small piston? 925.7 N (b) When the small piston is pushed in by

78. ## Chemistry PLZ HELP!!!!!

describe what happens to sulphur as it is heated from room temperature to about 250 degrees c mention the various allotropes encountered.

79. ## calculus

Suppose \$5000 is deposited in a bank account that compounds interest four times per year. The bank account contains \$9900 after 13 years. What is the annual interest rate for this bank account?

80. ## Calculus

Evaluate the integral by interpreting it in terms of areas. The integral from -3 to 0 of 5+(9-x^2)^1/2.

81. ## Geometry

Find the measure of the acute angle that the given line forms with a horizontal line. 1. Y=5x+3 2. Y=1/2x+4

82. ## physical

if a person exerts 250n force to lift a 1250n object using a simple machine, what is the mecahnical advantage of the machine

83. ## computer buinesss

List the two websites and write a paragraph for each on why you find this digital content interesting.

84. ## Calculus

Two automobiles are traveling on intersecting roads. The first automobile is traveling northeast at 35 km/h. The second automobile begins 7 km north of the first, and it is traveling east at 25 km/h. Assuming that these cars will continue at this rate,

85. ## physics

(a) How much heat is required to raise by 12.40°C the temperature of 1.4 kg of water. (b) How much heat is required to raise by 12.40°C the temperature of 1.4 kg of iron.

Equal volumes of monoatomic and diatomic gases of same initial temperature and pressure are mixed.What will be the ratio of sprcific heats of the mixture(Cp/Cv)?

87. ## Math 11

An investment earning simple interest at a rate of 1.10% per annum for a term of 5 years earned \$82.50 in interest. What was the principal?

88. ## calculus

A curve passes through the point (1,-11) and it's gradient at any point is ax^2 + b, where a and b are constants. The tangent to the curve at the point (2,-16) is parallel to the x-axis. Find i) the values of a and b ii) the equation of the curve

How would you solve the problem below using the subsitution method? 12x + 4 = 8y y = x - 7 Please explain to me and help. If you could show all the steps, that would help a lot. Thank you.

90. ## Science

Demarcus wants his friend, Alvin, to guess which planet he is describing. He tells Alvin that the planet is rocky and doesn't have any moons. What other clue would let Alvin be certain which planet Demarcus is describing? A)It has rings around it. B)It is

91. ## chemistry

Bill prepared 5.00-mL of borax solution at 59.2degrees C. He diluted the solution in an Erlenmeyer flask and titrated it to an endpoint with 27.05 mL of 0.500 M HCl. What is the saturation concentration of borate ions? I don't know what to do here. Does it

92. ## math

A colony of bacteria is growing exponentially, increasing in size from 200 to 500 cells in 100 minutes will it take the colony to double in size?

93. ## Discreate Math

Suppose that a department contains 13 men and 19 women. How many ways are there to form a committee with 6 members if it must have strictly more women than men

94. ## Physics

the wind blows with a force of 425N north on a sail boat, while the water exerts a force of 325N west on the sailboat. Find the magnitude and direction of the net external force on the sailboat.

95. ## English

What would be some problems a modern day Thoreau would find in today's society?

96. ## Physics

If you drop an object, its acceleration toward the ground is 10.0 m/s^2. If you throw it down instead, is its acceleration after throwing greater than 10.0 m/^2 ? Why or why not?

97. ## chemistry/ stioichiometry

Cu2S + O2- 2Cu +SO2 when 10.2 mol Cu2S react with oxygen, how many moles of Cu are formed? path?

98. ## math 11

Calculate the amount of interest earned in 10 years on \$1000 invested at 3.00% per annum, compunded annually?

99. ## Calculus

Which value of k will make the plane r=(k,3k,12) +s(2,2,3)+t(-1,1,3), s,teR passing through the origin? a) 2 b) 1 c)0 d) -1

100. ## Math

For an experiment on the titration of a supernatant liquid I need to calculate the number of moles of S2O3^2-^ ion required using the volume of SrIO3 solution(supernatant liquid) from the two trials that were conducted. For both trials the volume of SrIO3

101. ## Science

How many conformations does monosodium glutamate (MSG) have and why?

102. ## physics

A down jacket has a surface area of 0.82 m2 and is filled with a 3.8 cm thick layer of down, which has a thermal conductivity of 6.0 10-6 kcal/(s · m · C°). The coat is worn by a person whose skin temperature is maintained at 27° C. The outer surface

103. ## Chemistry PLZ HELP!!!!!

though both nitrogen and oxygen are diatomic gases, nitrogen is far less reactive than oxygen. Why?

104. ## calculus

A colony of bacteria is growing exponentially, increasing in size from 200 to 500 cells in 100 minutes will it take the colony to double in size?

Revise sentence for better understanding/communication 1.Business has an inordinate influence on governmental operations. 2. Our expectaions are that there will be increasement in commodity value. 3. Can we assertain the types of customers that have a

106. ## math 11

Calculate the interest due on the following credit card balances. a)An unpaid balance of \$1623.53 at a rate of 19.50% for 21 days. b)An unpaid balance of 2639.99 at a rate of 22.95% for 30 days.

When an ideal diatomic gas is heated at constant pressure then what fraction of heat given is used to increase internal energy of gas?

108. ## MATHEMATICS

How do you find the average deviation from these numbers: 290 , 270 , 250 , 300 , & 290. I think their mean is 280

109. ## chemistry/ stioichiometry

Cu2S + O2- 2Cu +SO2 when 10.2 mol Cu2S react with oxygen, how many moles of Cu are formed? path?

110. ## chemistry

What is the mass percent of oxygen in sodium bicarbonate (NaHCOÀ)?

111. ## (aig)math(Ms.Sue)

a string 28 yards long is cut into 10 equal pieces.what is the length of each piece?write your answer as a fraction and as a decimal.

cos 75 deg

113. ## Penn Foster

Would you please help me with these two questions on which i am not sure of my answers.? I marked my answers with a parenthesis. On the second question I can not make up my mind between c & d. Thank you for any assistance you can provide. waiting for your

114. ## Help with evalutation

Evaluate. 3^8a^10b^-5c^2/3^12a^7b^-3c^-2 a=4, b= 8 c=3

115. ## chem-entropy

a glassblower heats glass (the system) to its softening temperature. Is the entrophy change of the system is positive or negative?

116. ## Thermodynamics

Suppose an enzyme lowers the activation energy by an order of magnitude. What is the ratio of catalyzed rate to the uncatalyzed rate at at 25 °C? at 37 °C?

117. ## physics

How much energy expressed in units of food Calories (that is, kilocalories) is required to operate a 100 W light bulb for 14.70 hours?

An air bubble of volume 15 cc is formed at a depth of 50 m in a lake. If the temperature of the bubble while rising remains constant then what will be the volume of the bubble at the surface?(Given: g=10 m/s2 & atm. pressure = 1.0 * 100000 Pa) * Physics -

119. ## Physics

A pool ball initially traveling 5 m/s strikes a second pool ball of identical mass in a totally elastic collision. After the collision the first ball has veered off its original path and is now traveling at 3 m/s. Find the speed and angle of each pool ball

120. ## life orientation

Identify and describe one environmental problem that causes ill health,accidents,crises,and disasters within your community or any other community witin south Africa or globaLly

121. ## Chemistry

How many stereoisomers are possible for threonine?

122. ## chemistry

If 3.5 ml of distilled water is added to 1.5 ml of a 0.150M solution of CoCl2 what is the concentration of the resulting solution? please show the work

123. ## Life Orientation

Name institution/community organizations that are involved in supporting or giving redress to pollution ,explain how these organizations are involved in providing a safe and healthy enviroment

124. ## Science

Which of the following is not a variable in an investigation designed "how much light is needed for a spider plant to grow?" A.type of plant B.amount of water C.source of light D.amount of light B? Which of the following is the best investigation question?

125. ## English

Here are some more sentences on history I'd like you to check. 1) In particular, he wanted to defend his own interests by nominating the bishops. 2) First, he made his best friend, Thomas Becket, Archbishop of Canterbury,the chief bishop in England.

126. ## geometry

Find the height of a cone with a volume of 138 cubic meters and a base area of 46 square meters

127. ## Statistics

create a report with the following: the mean score for each question, the mean score for the entire test, a graph that represents the scores for each question. Evaluate the test by using the information in your report and conducting qualitative item

128. ## (aig)math(Ms.Sue)

twelve pails of the same size were used to fill a tank with water.the capacity of the tank was 42 gallons.find the capacity of each pail.hive your answers in gallons and quarts.

129. ## math

Suppose \$5000 is deposited in a bank account that compounds interest four times per year. The bank account contains \$9900 after 13 years. What is the annual interest rate for this bank account? i already set it up but i don't know where to go from there.

130. ## Math 11

Calculate the final value after 10 years if you invest 5000.0 at 2.5% per annum compunded annually?

131. ## math

Find the exact values of sin 2theta, cos 2 theta and tan 2 theta when cot theta = 4/3

132. ## algebra

So.....if Jane has a budget of\$290. How do I explain how I would find the amount she spent on books. Plzzz help!!

133. ## math

You bought one \$2 chance on an \$84 radio. Sixty chances were sold. What is the probability of your winning the radio?

134. ## trig

solve the equation of the domain 0¡Ü¦È¡Ü2¦Ð 3cos^2theta - 5costheta -1 = 3sin^2theta

135. ## World History

Three reasons why Japan closed its doors to the outside world

136. ## Interest

In 6 years, Jim wants to have \$47,230 to buy a new car. (a) How much must Jim save each month if the interest rate is 6% compounded monthly? \$ ______ (b) How much of the \$47,230 does Jim actually deposit and how much of it is interest? \$______(deposit)

137. ## chemistry

Write an equilibrium reaction for a buffer system made of the weak base, B, and its conjugate acid. If the buffer contains 1.05 M of B and 0.750M conjugate acid and has a pH of 9.50, what is the pH after 0.0050 mol HCl is added to 0.500 L of this solution?

138. ## Calculus

Explain the possible relationships between two lines in R^3

139. ## Science

25 cm of 1.0 mol dm− NaOH is added to 25 cm of 1.0 mol dm− HCl. The temperature rise is 6¢XC. Which reactants will also give a temperature rise of 6¢XC? A. 25 cm of 2.0 mol dm− NaOH and 25 cm of 2.0 mol dm− HCl. B. 50 cm of 1.0 mol dm− NaOH and

140. ## algebra

Kayla Wants To write an Expression that will always produce an odd integer. Which of the Following will always produce an odd integer for any given integer ?

141. ## physics

an isolated quantity of an ideal gas at 297.2 K has a volume of 14.96 L at a pressure of 1.63 atm. What is the volume of this gas sample when the absolute temperature is reduced to one third and the pressure is divided by five?

142. ## world history

What was the cause of the peloponnesian war ? A.greeks sought revenge for the persian wars B.Sparta wanted control of the powerful athenian army C.A spartan murdered the athernian ruler pericles D.Many grees outside of athens resented athenian domination.

143. ## Chemistry

What will happen to the room temperature if the refrigerator door is kept open?

144. ## English

I still have to add a few sentences on history. Thank you very much. 1) War with France broke out in 1337 when Edward III claimed the crown of France because his mother was the French king's sister. This was the beginning of the Hundred Years' War, which

145. ## Physics

A large solid cylinder rolls without slipping down a 40 m long hill with a 30 degree slope. The cylinder then rolls a short distance over level ground and then off a 20 meter high sheer cliff. How far from the base of the cliff does the cylinder land?

146. ## geometry

Find the height of a cone with a volume of 138 cubic meters and a base area of 46 square meters

1)What is the pH of a saturated solution of lead(II) hydroxide? The Ksp= 4.0e-15 Pb(OH)2 4.0e-15 = (x)(2x)^2 = 4x^3 I divided by 4 and took the cube root and got 1.12e-5 but I am not sure I took the cube root correctly. -log(1.12e-5)= 4.95 14-4.95 = 9.05

148. ## science

a 150g of a metal at 80degree C is placed in 100cm3 of pure water at 20degree C. the final temperature of the system (metal+water) is 23degree C. what is the specific heat of the metal? i got the ans -0.16 by using formula mCdelta T(water)=mCdeltaT(metal)

149. ## math

You bought one \$2 chance on an \$84 radio. Sixty chances were sold. What is your expectation?

150. ## algebra

add if possible simplify the expression (8x^3y^2+5x^2y^2+6xy^2)+(4x^3y^2-3xy^2)

151. ## Algebra 2

Use the associative property of multiplication to write an expression equivalent to 8x*(4y*7z)

152. ## Algebra 2

what is the opposite of 49x^2y A. 49x^-2y b. -49x^2y c. 1/49x^2y d. -49/x^2y

153. ## ALGEBRA

(a) Simplify the expression. 3(x - 2) - 9(x**2 + 7 x + 4) - 5(x + 8) (a) Simplify the expression.

154. ## Algebra 2

24 more than the quotient of b and 2 is 8. Solve for b.

155. ## Circuits

I have to calculate the voltage across the resistor of an rlc circuit where the 4.7nF capacitor is in parallel with the .200 H inductor for different frequencies (starting with 1000 Hz) They appear at the top of the circuit and they both looked to be in

156. ## maths

calculate the 16th term of an arithmatic progression he its fifth term is 6 and its 12th is 41.

157. ## math

How do you turn four times the sum of five and a number into a variable expression?

158. ## p

A roller coater has a first drop of 140 meters and then enters a circular loop. Find the maximum radius of the loop such that the coaster never leaves the track at the top of the loop. Using the radius found in part 1, calculate the largest centripetal

159. ## Math

Beth need enough ribbon to go around the perimeter of her blanket. If the blanket measures 45 inches by 60 inches, how many inches of ribbon will beth need to buy?

160. ## Calculus and vectors

A plane, π, has 3x-5z+3=0 as its Cartesian equation. Determine the Cartesian equation of a plane that is perpendicular to π and contains the point P(2,9,-3)

161. ## Science

A spacecraft of mass 500kg lands on the moon. Calculate the moon's gravitational pull on it given that mass of the moon is 7.5 x 10^22kg and radius of the moon is 1.6 x 10^6m.

162. ## math

2 men ran 36 parts. X ran 5 times as many as Y. how many parts did Y run?

If you add 0.35grams NaF to 150mL of a 0.30M HF, what is the pH of the resulting solution? To start off would I use the value of 1.4e-11 for F^-^ and 7.2e-4 for HF?

164. ## geometry

Find the geometric mean each pair of numbers. If nessary, give the answer in simplest radical form. 5 and 8

165. ## Physics

If you drop an object, its acceleration toward the ground is 10.0 m/s^2. If you throw it down instead, is its acceleration after throwing greater than 10.0 m/^2 ? Why or why not?

166. ## Chemistry

Arrange these acids in terms of increasing acidity: CH3COOH, NH3+CH2COOH, CH3CONHCH2COOH My answer is CH3COOH,CH3CONHCH2COOH,NH3+CH2COOH . Is this correct Dr.Bob?

167. ## chemistry

A student tipped the watch glass and spilled the solution containing organic component X. Use the data given below to estimate the percent of organic solid X in the sample. Mass of sample 0.6084g Mass of water soluble component, Y 0.1565g Mass of insoluble

168. ## physics

Plz 2mrow is a dubmition day.on how gravitational acceleration is used to benefit mankind and environment.how can rural people also benefit from the use of gravitational acceleration

169. ## World History

What was the only thing that united East & West Pakistan? Time period: - Decolonization in India and Africa, 10th grade history

170. ## world history

Why were the European nations able to carve Africa up for themselves ? Can you give me some hints to be able to answer this question please? thank you

171. ## English

Writeacher, I hope you can help me clarify the following sentences. I can't understand the relation between the knights and the barons. 1) Henry II was successful in bringing 3)order and stability. To avoid civil wars, he needed to reduce the power of the

172. ## Math

I don't remember sampling methods... i do know that there are three and one of them is litteraly called 'random'. if i can please be reminded of the methods i can finish the last 3 problems of my math.... i don't like math especially if you have a field

173. ## physics

A house with its own well has a pump in the basement with an output pipe of inner radius 6.4 mm. Assume that the pump can maintain a gauge pressure of 420 kPa in the output pipe. A showerhead on the second floor (7.5 m above the pump's output pipe) has 38

174. ## Data mangement

Hugo has a job interview at Telus. He has a 56% of waking up late on the morning of the interview. When he wakes up late he has a 33% chance of missing his bus to take him to the interview. At this rate he will be late and he has a 27% chance of actually

175. ## geography

calculate the freeboard of a 10-m thick iceberg in saltwater (seawater density of 1025 kg/ m^3)

176. ## geometry

Give an example of an infinite set.

177. ## history

How was the civil rights movement of the 1950s and 1960s a continuation of the Reconstruction-era struggle for blacks to achieve equality?

178. ## Algebra 2

Find the slope of the line containing these points. (1/8, 1/4) and (3/4, 1/2)

179. ## Chemistry

Calculate the volume of ovygen at STP collected at 25.0 L at 775 mm and 296 Kelvins. Yhe mercury level inside the tube is 28.0 mm higher than outside. Please help me solve, I am at a loss :(

180. ## math

how do you draw a rectangle with a perimeter of 10 units?

181. ## Chemisty Help!!!!!!!!

show how you would obtain (the orbitals used) and the possible types (the orbitals produced) for hybridization of a carbon atom. you must report the shape and the number of orbitals of each type used and produced for each type of hybridization.

182. ## SS7R

The 2nd amendment is the right of the people to keep and bear arms. A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed It gives private citizens the right to own

183. ## Science

Which of the following is not a variable in an investigation designed "how much light is needed for a spider plant to grow?" A.type of plant B.amount of water C.source of light D.amount of light B? Which of the following is the best investigation question?

184. ## scientist

Pretend you are a scientist and you just found a solid substance in the ground where you were digging. What types of tests would you do on this substance? How would you determine if it is a rock or a mineral? Describe your substance (yes you can make

185. ## math

in 2001 there were about 2,317,000 marriages in the United States. Ms.Sue, I know you want me to do this by myself and you would do the explaining. Ms.Sue here is one of the example problems from my study links.I don't get how they find the percentage. My

186. ## AP Chemistry

Calculate the pH of a 75.0 ml solution containing 0.85 M lactic acid after the addition of 0.0225 moles NaL (assume a negligible volume change.)

How would you solve the problem below using subsitution method? 7x - 2y = 5 x = y If you could explain and show this step by step, it would help a lot. How would you solve the problem below using combination method? 3x - 2y = 12 -3x + 8y = -6 If you could

188. ## Geometry

Find the center of the circle using the equation provided. Please show work! x^2 + y^2 = 16

189. ## Math

IN a square with each side measuring 6inches what is the ratio of the perimeter to the area? Please show work for this!!

190. ## Simple Interest

The Johnsons have saved \$45,000. They invest their money in a bank and thei account earns 7.5% interest. How many years will it take to earn \$74,000? *PLEASE PROVIDE AN EXPLANATION*

191. ## English

Can you please check these sentences on history? Thank you, Writeacher. 1) Richard was succeeded by his younger brother John I, called Lacklan because he lost Normandy and most of his French territories. 2) He levied higher taxes an his policy (of heavy

192. ## History

How were the issues of the civil war similar to those of the american revolution.

193. ## Calculus

Which of the following is the x-intercept of the plane 2x-4z+1=0? a) P(2,0,-4) b) P(0,0,0) c) P(-1/2,0,0) d) P(0,0,1/4)

194. ## Social Studies 7R - Bill of Rights Project

I have a project for social studies that is due when we come back from break (4/16/12). Choose one of the projects listed below to show your understanding of one or more of the following Amendments 1, 2, 3, 4, 5, 6, 7, and 8 to the Constitution: I choose

195. ## Chemistry PLZ HELP!!!!!

Differentiate between oxide, a peroxide, and a superoxide?

196. ## Calculus

If m ≤ f(x) ≤ M for a ≤ x ≤ b, where m is the absolute minimum and M is the absolute maximum of f on the interval [a, b], then m(b − a) ≤ b f(x) dx a≤ M(b − a). Use this property to estimate the value of the integral. The integral from 0 to

197. ## algebra

Using the formula for BMI: B = 703(w)/ h² When the weight is 100 lbs and the BMI is 20, how do I figure out the persons height?

198. ## physics

on how gravitational acceleration is used to benefit mankind and the environment.how can rural people also benefit from the use of gravitational acceleration

199. ## math

What is the mode of the scores for Game 3? _____ Team | Bowling Scores Member | Game 1 | Game 2 | Game 3 Bob | 92 | 118 | 105 Craig | 127 | 101 | 96 Kim | 131 | 128 | 122 Nancy | 127 | 109 | 115 Phillip| 113 | 109 | 122 what is the mode in math again? and

200. ## physics

a toy car is accelerating across the floor at 6.0m/s^2 and a force of 10N is creating the motion. what is the mass of the car?

201. ## to ms.sue

I still don't get it. do we divide every # by 2. why do we need to move 2 decimal spaces?

202. ## Math

write the particular equation of a quartic function that could, according to Descartes Rule of Signs have four positive zeros.

203. ## social studies

what used to be celebrated before april fools day

204. ## accounting

In order for companies to prepare and issue financial statements, their accounting equations (debits and credits) must be in balance at year end. Discuss how errors and misstatements may occur given this requirement. Bookkeeping is largely done today using

205. ## meaning

what is another definition for dandelion besides a type of flower. my teacher said there was another definition for it.

206. ## biology

What part of the brain controls sleep and how does it work. I am looking for a easy to understand answer because when i have searched i do not understand it.

207. ## Government

What restrictions on freedom of speech and freedom of the press are constitutionally permissible?

208. ## MATH

JUST WOULD LIKE TO KNOW IF I DID THESE PROBLEMS RIGHT. THANKS IN ADVANCE Starting a Business Starting your own business can be exciting and daunting at the same time. Businesses use math when managing finances, determining production levels, designing

209. ## Calculus and vectors

Verify please and thank you~ 1. Does the line (x-7)/3=(y+8)/6=(z+4)/5 and the point P(10,-2,1) determine a plane? Answer: Yes, it is a plane because when I substituted the point P(10,-2,1) into the equation, I got the coordinates (1,1,1) If the coordinate

When the temperature of a gas in a vessel is increased by 1C then the pressure is increased by 0.5%. what will be its initial temperature?

211. ## English

1. Let's not rush it. (What does 'it' refer to? What other expressions can we use it instead of the sentence?) 2. Don't give up on your dreams. 3. Don't give up your dreams. (Are both grammatical?)

212. ## Econ

Explain how a perfectly competitive market promotes productive efficiency (minimum average costs).

213. ## Art

Explain how Florence reflects the ideals of the dominant city-state and how some of the geographical, economical, social, and artistic forces shape this ideal

214. ## chemistry

You have a 1 L container of a gas O 2 at 20°C and 1 atm. Subtracting the weight of the container, what is the mass of the gas?

215. ## history

What is the origin of the fortune cookie? What are the words on the piece of paper inside the fortune cookie?

216. ## math

Suppose the cards shown are mixed and placed facedown. Think about drawing a card and without replacement drawing a second card. Give the probability in simplest form: P(A, B) = _____ ————— ————— ————— ————— | A | |

217. ## math

You bought one \$2 chance on an \$84 radio. Sixty chances were sold. Was buying a chance a "good deal"?

218. ## Math

Factor over {complex numbers} 9x^2 + 49

219. ## Physics

what is your power output if you climb a 2m ladder in 10 seconds? suppose your height is 565N.

220. ## Household appliances

Do you guys know of any websites that talk about the efficienty of household appliances and how it has changed over the years? Thanks

221. ## to ms.sue

on your last post you said move two decimal places to the right.2 places to the right is 0.06 not 0.063

222. ## math

(5x2 + 9) + (7x2 + -8) = _____?

223. ## social studies

can you help me write a introduction paragraph for the comparison between the iraq and vietnam war

224. ## History

Was the republican party consistent in its policies from the 1850s-1877?

225. ## math

The mean of a set of 51 data points is 3.04. If a data value of 16 were added to the data set, what would be the approximate value of the new mean?

226. ## Chemistry PLZ HELP!!!!!

what are the names of three important nitrogen fertilizers with their formulas?

227. ## Science

How can rural people benefit from gravitational acceleration

228. ## Calculus

Which of the following planes is the equation for the pane with an x-intercept at P(2,0,0), a y-intercept at Q(0,-3,0), and is parallel to the z-axis? a) 3x-2y-6=0 b) 2x-3y+z-6=0 c) 3y-2z-6=0 d) z=-6

229. ## math

what is a translation over a vertical line?

230. ## Spanish

i need help translating these sentences. only using the verb "estar" 1. My grandfather took my brother to the university. 2. My best friend is my work colleague. 3. It's my boyfriends necktie. 4. My female cat is in the garden. 5. My male cousin and I had

231. ## Science

How can rural people benefit from gravitational acceleration

232. ## Civics

Could someone explain what the Dennis vs. United States trial 1951 was about? I'm having a little bit of trouble understanding it. I googled it, but I just need a brief summary that explains well (:

233. ## algebra

Jane spent 62% of her school budgets on books. In degrees what measurement would would that section be on a circle graph

234. ## Math

Paul's car can have wheel's ranging from 18-24 inches radius. He has the option of getting a wheel with the diameter of 2 and half feet, 3 and half feet, or 4 and half feet. What size wheel should he purchase? Explain?

235. ## Financial Math

Suppose that you decide to lease a car. At the end of the 48-month lease period, you need to make a lump-sum payment of \$5000 if you want to keep the car. You decide to save up, just in case you decide to keep the car; if you don’t keep this car, you

236. ## Physics pls help

At what depth in water is the pressure equal to 2m atmosphere. Explain how

237. ## Math

A bag of marbles contains 5 red, 12 blue and 5 yellow. What is the ratio of red marbles to non red marbles?

238. ## Chemistry

A saturated solution of a certain metal(II) chloride has a chloride ion concentration of 0.032M. The Ksp for this compound can be determined to be is? This is similar to another question I posted that gave the Ksp and I had to find the pH. I am not sure

239. ## Math

Hello, I need help to understand step by step of my math problem. I am not understanding how to get the answer. Thank You for your help Hope

240. ## life orientation

one environmental problem that causes ill health, accidents, crises, and disasters within south africa.

241. ## math

joe is putting fence all aroung four sides of a rectangulr flower bed it is 6 feet wide and 4 feet long each section of the fence is 2 feet long how many sections of fencing will joe need

242. ## Math

Given P(x) = x^3 - 3x^2 - 5x + 10 a evaluate P9x) for each integer value of x from -3 through 5 b. Find all zeros of P(x) d. Prove that 5 is an upper bound on the zeros of P(x)

243. ## math

(2x +3) + (4x + 8) = What's the answer? and how to solve these problems?

244. ## Pre Cal

tan 2x- tan 6y/ 1+ tan 2x tan 6y

245. ## Human Relations

I'd would like to learn about how Pope John Paul II was a good leader. This is what I've written so far: Pope John Paul II was a man !@#\$%^&presented the Roman Catholic Church very well with his charity work and dedication to his faith.

246. ## Algrebra

I need to find the approximate surface area of a cone with the R=5 and L=6. I thought I figured it out by 3.14(5)(6) which will give me 94.2 I then would take 94.2 +3.14(5)squared and I came up with 172.7, but my answer should be either 20m squared, 98m

247. ## math

If the hourly sales at a certain register in a supermarket are normally distributed with a mean of \$650 and a standard deviation of \$60, find the probability that the sales during a randomly selected hour are greater than \$800.

248. ## algebra

systems of nonlinear equations i need to help i have tried this problem but i cannot find the right answer i need to determine the real solutions for this: x^2+4xy=10 4x^2-xy=6

249. ## linear alg

How to find the characteristic equation of this matrix? 4 -5 2 -3

systems of nonlinear equations i need to help i have tried this problem but i cannot find the right answer i need to determine the real solutions for this: x^2+4xy=10 4x^2-xy=6

251. ## Chemistry

Attn: Dr. Bob Thank you so much for your help on this--greatly appreciated!

252. ## English

Homework Help: history Posted by rfvv on Monday, April 9, 2012 at 8:18am. What is the origin of the fortune cookie? What are the words on the piece of paper inside the fortune cookie? history - Ms. Sue, Monday, April 9, 2012 at 12:17pm The words on the

253. ## calculus

Let f be the function given by: f(x)=1/5x^5/2+x^-1/2, for all x in [1,4]. Find the length of the graph of f.

254. ## health

what are two important aspects of mental healt

255. ## Titanic

Was the movie Titanic based on a true story?

256. ## Chemisty Help

for each of the molecules below, show the dipole you would expect. you must show the direction of the dipole - arrow head pointing toward the negative end. 1) CF4 2) CH3Cl

257. ## maths functions

given points A(-1,0) B(3,0) C(0,3) T(1,4) and D(-2,-5) on F find the equation of F in three different ways

258. ## hca/210

examples of position in healthcare for the four functions of management

259. ## math

What is the mean of the scores for Bob? _____ Team | Bowling Scores Member | Game 1 | Game 2 | Game 3 Bob | 92 | 118 | 105 Craig | 127 | 101 | 96 Kim | 131 | 128 | 122 Nancy | 127 | 109 | 115 Phillip| 113 | 109 | 122 what is mean in math again?

260. ## math

If each inch is equal to 3 feet, what is the area of a rectangular rug with a length of 3 inches and a width of 2 inches?

261. ## chemistry

help me find which reactant is the limiting reactant when 74 g NaOH and 44 g CO2 are allowed to react when the equation is (2NaOH+1CO2=Na2CO3+1H2O)

262. ## Chemistry

Disulfide bonds in protein: a) results from an oxidation of thiol b)help to maintain the shape of proteins c)can be broken by reduction d)all of the above I know the option a) is correct,but I'm confused between options b)& c) as the informations on those

263. ## Chemistry-1

How do we find the molar mass of a gas produced? Example if 1.00 kg of N2H2 reacts with 1.00kg of H202. How many moles of N2 could be formed? THe equation is N2H2+2H202 > N2 + 4H20

264. ## Data mangement

Mark selects one card randomly from a standard deck of cards. What is the probability that he will select either an even number or a heart?

265. ## Religion

What are some things that Tevye struggles with in the movie "Fiddler on the Roof"?

266. ## math

There were 25 students who completed a survey. There were 11 boys and 14 girls. One survey was picked at random. To the nearest hundredth, what is the probability it was completed by a girl?

267. ## History

Which of the events (CPR, NWMP, Pacific Scandal, Dominion Land Act) was most important in influencing settlers to move to Western Canada?

268. ## to ms.sue

thank you again. you have the patients to teach me, a fourth grader. you also don't get tired of answering everyone's questions. you always have the courage to try. thank you so very much!

269. ## algebra

systems of nonlinear equations i need to help i have tried this problem but i cannot find the right answer i need to determine the real solutions for this: x^2+4xy=10 4x^2-xy=6

270. ## math

"write down a rule for finding the volume(v litres) remaining after h hours." I dOnt know how to do this.

271. ## College Algebra

Annual profit in thousands of dollars is given by the function, P(x) = -.1x^2 + 50x - 300, where x is the number of items sold , x >= 0. 1.describe the meaning of the number -.1 in the formula. 2.describe the meaning of the number -300 in the formula.

272. ## Chemistry PLZ HELP!!!!!

give five uses of phosphorus either as the acid or as one of its salts.

273. ## art history

how did monasticism and feudalism differ? give two examples

274. ## Math

I'm having a hard time with this problem. The book tells you the answer is 5, but I don't know how they got there. log(x+25)= 1+ log(2x-7)

275. ## Physics

a foam boulder has a mass of 2kg and a velocity of 20m/s. a stone boulder has the same velocity (20m/s) but a mass of 20kg. which of the two has more momentum? Explain.

276. ## Math

Find the particular equation of the cubic function that contains (-2,-35), (1,7), (2,9), and (3,25)

277. ## Circuits

How do I design a low pass filter for an Fc = 4000 Hz and a high pass filter for Fc =2000 Hz?

278. ## Chemistry PLZ HELP!!!!!

a. describe the frasch processfor mining sulfur. b. why must the water be superheated?

279. ## social studies

comparison between iraq and vietnam war

280. ## Language Arts

I have to write a 5 paragragh paper on what clean air means to me and my community. I have 2 done and I can't think of what to write about since the topic is so simple. Please help.

281. ## to ms.sue

thank you so much . good thing you'r here.

282. ## math

13 - 8x = 5x + 2 x= -11/-13?

283. ## logic

Truth tables can (Points : 1) display all the possible truth values involved with a set of sentences. determine what scientific claims are true. determine if inductive arguments are strong. determine if inductive arguments are weak.

284. ## history

how did the cold war increase tension in the middle east?

285. ## Engineering

What is the upper tripper point (UTP) of a comparator with hysteresis if R1 = 47 kÙ, R2 = 68 kÙ and the maximum positive output voltage is 10V?

286. ## historty

who was lowell mill strikers

287. ## French

What is the difference between the efficiency of appliances in the US vs. France and the amount of power used? thanks

288. ## life orientation

one environmental problem that causes ill-health,crises,accidents and disasters within south africa

289. ## math

Solve and simplify (3+9i)-(12-5i) 8+6i/7-5i