1. Chemistry

About 13% of the acid in a 0.10M solution of a weak acid dissociates to form ions. What is the H3O+ concentration? What is the OH- concentration? What is the pH of the solution?

2. math

Total hours: 42 (including 4 hrs sick leave, 6 hrs travel) Week 2 — Total hours: 46 (including 5 hrs travel)What percentage of the recorded time did the worker spend traveling?

3. math

Suppose you are looking to buy a \$5000 face value 26-week T-bill. If you want to earn at least 1% interest, what is the most you should pay for the T-bill?

4. Physics

A 2600 kg truck traveling at 72 km/h slams on the brakes and skids to a stop. The frictional force between the truck and the road is 8200 N. Calculate the mechanical work required to stop the truck and the distance the truck travels before stops.

5. math

suppose you are looking to buy a \$5000 face value 26 week T-bill. If you want to earn at least 1% interest what is the most you should pay for the T-bill

6. Physics

Consider the following four possibilities for two point charges and choose the one(s) that do not change the magnitude of the electrostatic force that each charge exerts on the other: A. Double the magnitude of each charge and double the separation between

7. Chemistry

A) A compound distributes between water (solvent 1) and benzene (solvent 2) with Kp = 2.7. If 1.0g of the compound were dissolved in 100mL of water, how much compound could be extracted by three 10-mL portions of benzene? B) If the value of Kp is 0.5 for

8. physics

Jason applies a force of 4.00 newtons to a sled at an angle 62.0 degrees from the ground. What is the component of force effective in pulling the sled horizontally along the ground?

9. Algebra

A plane traveled 580 miles to Anakara and back. The trip there was with the wind. It took 5 hours. The trip back was into the wind. The trip back took 10 hours. Find the speed of the plane in still air and the speed of the wind.

10. maths

Ten blackberry plants started growing in my yard. Absent constraint, blackberries will spread by 200% a month. My yard can only sustain about 50 plants. Using the logistic growth model, a. Write a recursive formula for the number of blackberry plants in my

11. maths

Marie can afford a \$250 per month car payment. She’s found a 5 year loan at 7% interest. a. How expensive of a car can she afford? b. How much total money will she pay the loan company? c. How much of that money is interest?

12. math

Use a table of trigonometric values to find the angle è in the right triangle in the following problem. Round to the nearest degree, if necessary. cos è = 0.8192 A = 45 H =?

13. math

A native wolf species has been reintroduced into a national forest. Originally 200 wolves were transplanted. After 3 years, the population had grown to 270 wolves. If the population grows exponentially, a. Write a recursive formula for the number of wolves

14. chemistry

The normal boiling point of ethanol is 78.5C. Using the following information: delta H formation (C2H5OH (g))= -234.38 kJ/mol determine the enthalpy of vaporization of ethanol. I know it should be around 39.3 according to a table in my textbook, however, I

15. maths

You deposit \$10,000 in an account earning 4% interest compounded monthly. a. How much will you have in the account in 25 years? b. How much interest will you earn?

16. Chemistry

C3H8 + 5O2 --> 3CO2 + 4H2O what are the oxidation #'s of each? What is being oxidized? reduced? Please explain

17. Math

Solve for the length of the unknown side in the following right triangle. (Side AC is the hypotenuse.) Round your answer to two places, where applicable. Side AB ? Side BC=12 Side AC=19

18. maths

The population of the world in 1987 was 5 billion and the annual growth rate was estimated at 2 percent per year. Assuming that the world population follows an exponential growth model, find the projected world population in 2015.

19. Chem

How long must a current of 1.20 A pass through a sulfuric acid solution in order to produce 25.0 mL of H2 gs at 25 degrees C and 1 atm pressure?

20. US History

1.Which of the following statements about Woodrow Wilson is true? A) He wanted to place strict government controls on corporations. B) He overturned discriminatory laws against African Americans. C) He advocated eliminating the income tax. D) He opposed

21. Science

container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?

22. chemistry

How many moles of NaOH must be added to 1.00L of this solution to increase the PH to 9.25?

23. Science

A car's engine is only 12% efficient at converting chemical energy in gasoline into mechanical energy. If it takes 1.8 x 104 N of force to keep the car moving at a constant speed of 21 m/s, how much chemical energy would be needed to move the car a

24. maths

How much would you need to deposit in an account now in order to have \$20,000 in the account in 4 years? Assume the account earns 5% interest.

25. Chemistry

How much 0.300 M NaOH is required to completely neutralize 30.0 ml of 0.15 M HClO4 Clue: M1V1=M2V2

26. maths

You deposit \$1000 each year into an account earning 8% compounded annually. a. How much will you have in the account in 10 years? b. How much total money will you put into the account? c. How much total interest will you earn?

27. chemistry

1) a student used 3.50 g of salicylic acid. calculate theoretical yield 2) the actual yield (from experiment) was found to be 1.50 g less than the theoretic yield (mass), calculate the percent yield 3) t

28. History.

How did the role of the federal government change during the Progressive Era of the early 1900s. Include specific progressive legislation, discuss presidents and the enhanced power of the federal I need some help with finding some information and

29. Science

A car's engine is only 12% efficient at converting chemical energy in gasoline into mechanical energy. If it takes 1.8 x 104 N of force to keep the car moving at a constant speed of 21 m/s, how much chemical energy would be needed to move the car a

30. Physics

There are four charges, each with a magnitude of 2.65 microcoulombs. Two are positive and two are negative. The charges are fixed to the corners of a 0.408-m square, one to a corner, in such a way that the net force on any charge is directed toward the

31. US Government

Why do we have more safeguards for accused criminals than the victims themselves?

32. Updated Math Question

The radius of circle A is 9 times greater than the radius of circle B. Which of the following statements is true? A.The area of circle B is 9 times greater than the area of circle A. B.The area of circle A is 9 times greater than the area of circle B C.The

33. Calc

After its fastest rate of growth ever during the 1980s and 1990s, the rate of growth of world population is expected to slow dramatically in the twenty-first century. The function G(t) = 1.58e−0.213t gives the projected annual average percent population

34. math

you deposit \$10000 in an account earning 4% interest compounded monthly. how much will you have in 25 years? how much interest will you earn

35. physics

A 5 g bullet is fired into a 2 kg wooden block attached to a spring with a force constant of 20 N/m. It lodges in the block, and the block and bullet compress the spring until they come to a rest. If the bullet was moving at 1000 m/s just before the

36. geometry

Find the similarity ratio and the ratio of perimeters for two octagons with area 18 square inches and 50 square inches

37. Physics

A student applies a force of magnitude 39.0 N at an angle of 22.6o with the horizontal to push a 4.00-kg textbook 1.00 m across a table from rest to a final speed of 1.75 m/s. Find the work done by friction on the textbook.

38. physics

A vertically hanging spring has a mass of 50 N hanging from it. Under these conditions, the spring stretches 10 cm. The spring is then placed on a horizontal table and stretched 20 cm. What force is required in the second scenario?

39. Physics

The force of gravity on the moon is said to be 1/6th of that on the earth .what would be the mass of 12kg weighed on the surface of the earth and moon

40. History

Social Darwinists believed that A) a large empire was the key to economic growth. B) the best country would win any international competition. C) each nation should be made up of only one ethnic group. D) military might was the most important measure of a

41. Chemistry

How much 0.300 M NaOH is required to completely neutralize 30.0 ml of 0.15 M HClO4 Clue: M1V1=M2V2 I still don't get it to i times .300x30.0 then times .300 x.15 i just don't understand what i am actually suppose to multiply

42. critical thinking

Please post a substantive response to the following discussion questions by clicking on Reply: Think about the following stereotype. Would they invoke the same kind of images for everyone? Which are negative and which are positive? How do you think they

43. maths

How much money will I need to have at retirement so I can withdraw \$60,000 a year for 20 years from an account earning 8% compounded annually? a. How much do you need in your account at the beginning b. How much total money will you pull out of the

44. Chemistry

so would my answer be 15ml How much 0.300 M NaOH is required to completely neutralize 30.0 ml of 0.15 M HClO4 Clue: M1V1=M2V2

45. Statisics

The state lottery claims that its grand prize is \$1 million. The lucky winner will receive \$50,000 upon presentation of the winning ticket plus \$50,000 at the end of each year for the next 19 years. Why isn't this really a million-dollar prize? What would

46. Macro economics

Suppose that the residents of Veggieland spend all of their income on cauliflower, broccoli, and carrots. In 1998 they buy 100 heads of cauliflower for \$200, 50 bunches of broccoli for \$75, and 500 carrots for \$50. In 1999 they buy 75 heads of cauliflower

47. English

Instead of toilet training her son at 18 months of age as her mother recommends, Melissa is waiting until her son is emotionally ready to begin toilet learning. How will Melissa know when her son is emotionally ready?

48. Calc

The percentage of a certain brand of computer chips that will fail after t years of use is estimated to be P(t) = 100(1 − e−0.1t ). What percentage of this brand of computer chips are expected to be usable after 6 years? (Round your answer to one

49. geometry

determine the coordinates of the midpoint of the line segment whose endpoints are A(0, 2, 4) and B(-8, 2, -6)

50. algebra

At an auto show, a car dealer asked the first 10 visitors their ages and the kinds of cars they own. The Venn diagram shows the details. A Venn diagram titled Ages of Car Owners, indicating the ages of owners of each type of car. Each of the three circles

51. Calculus

Find the point on the graph of function that is closest to the point. f(x)=x^2 (2,1/2)

52. statistics

So if a scale has 30 items in it, and if an individual gets a score of 20 what does this mean? The only way to answer this is to look at the standardization sample, find out what the mean score in the sample was, let's say 15, and standard deviation in the

53. Chemistry

What is the HCl concentration if 72.1ml of 0.035M NaOH is required to titrate a 20.0ml sample of the acid?

54. Physics

container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?

55. chemistry

3) The melting point range of an unknown substance was determined to be 120-180 degree celcius. what can you tell about the purity of the unknown

56. english

Do you think that paying attention to your audience, purpose, and content improves the influence of your writing? Why or why not?

57. Healthcare Finance

Metropolis Health System has received a wellness grant from the charitable arm of an area electronics company. The grant will run for twenty-four months, beginning at the first of the next fiscal year. Two therapists and two registered nurses will each be

58. MAth

What is the area of a parallelogram with a base of 25 meters and a height of 8 meters?

59. Trigonometry

Find the value of x on this right triangle when a=20 b=5x-10 and c=2x(Square root of 5) A. x = 15 B. x = 10 C. x = 12 D. x = 16 A wheel 5.00 ft in diameter rolls up a 15.0° incline. How far above the base of the incline is the top of the wheel after the

60. Calc

Compute the derivative of f(x)=5^x^2+1 using logarithmic differentiation.

61. Physics

A 1.20kg ball is rolled down a frictionless ramp whose top is 0.80m above a horizontal spring with ks = 800N/m. The ball reaches the horizontal just in front of the spring. a.) What is the kinetic energy of the ball just before it contacts the spring? b.)

62. statistics

So if a depression scale has 30 items in it, and if an individual gets a score of 20 what does this mean? The only way to answer this is to look at the standardization sample, find out what the mean score in the sample was, let's say 15, and standard

63. statistics

If the null hypothesis for the example survey posted is "There is no correlation between level of drug use and satisfaction with one's personal life." What are the three possible alternative hypotheses that could be stated, using only the variables and

64. math

The lengths of two adjacent sides of a square are represented by 5x+11 and 7x-3. What is the perimeter of the square?

Hi, a particle is moving in simple harmonic motion such that a = -4x. ( x in metres, t in seconds) Find the maximum speed at which the particle is travelling. Velocity = 6cos2t. My teacher said to put t = 0 and sub it into velocity equation above, but I

66. Law

Why do some believe cell phone while driving should be banned? how is it any different than talking to the people on the passenger's side or driving with you?

67. Ethics

you have examined four approaches to explaining criminal behavior: classical, positivist, structural, and ethical. Select and research one of those approaches. Identify the strengths and weaknesses of your selected approach. Explain whether you think the

68. calculus derivatives update

update yes, sorry I wrote it wrong (mx)= (x^5-5x^3 +7x-4)^10 * (4x^9 +19)^23 Thanks again

69. Accountinhg

A difficult problem in calculating the total costs and expenses of a department is: Determining the gross profit ratio. Assigning direct costs to the department. correct Assigning indirect expenses to the department. Determining the amount of sales of the

70. Statistics

Measurements on the percentage of enrichment of 12 fuel rods used in a nuclear reactor were reported as follows; 3.11 2.88 3.08 3.01 2.84 2.86 3.04 3.09 3.08 2.89 3.12 2.98 a. Test the Hypothesis H0: µ = 2.95 versus H1: µ 0 ≠ 2.95, and draw appropriate

71. math

Issa IS driving to the airport to catch a flight to Miami, and Her arrival depends on traffic. If the traffic is light, then she can drive 60 mph and arrive at the airport 1 hour early. If traffic is heavy, she can drive 35 mph and arrive at the airport on

72. Physics

container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?

73. Math

Through (4, 3), m = - 3 A) y = -3x+1/15 B) y = -1/3x + 15 C) y = -3x + 15 D) y = -3x - 15

74. Sociology

What are the implications of a dual relationship? I don't need the answer, I just need to know what the question means by "implications". Like consequences??? Thanks

75. Trig/Physics

Joe walks 5 miles in the direction degrees North of East, and then 10 miles in the direction 20 degrees West of North. (a) How far is Joe from his starting position? (b) In what direction is Joe from his starting position?

76. gemetry

An identification code is to consist of two letters followed by six digits. How many different codes if repetition is permitted.

77. physics

A man on the top of a 40 meter tower directly overhead the road is watching a car moving on a straight road. The car speed makes an angular velocity with respect to the observer in a constant speed of 0.16radian/sec. Find the linear velocity of the car

78. math

sin è=? O=8 H=16

79. english

Identify a serious error you find challenging to overcome in your own writing. What method will you use to avoid this error? Would you recommend the method to others? Why or why not?

80. Penn

Wi-Fi stands for

81. Finance

gross profit gross margin is equal to

82. Chemistry

If 50.0 mL of methane gas at 75.5 degrees C is cooled to 5.45 degrees C, what would be its new volume?

83. Calculus

f(x)= 5ln(x)/x^7

84. Physics

A student applies a force of magnitude 39.0 N at an angle of 22.6o with the horizontal to push a 4.00-kg textbook 1.00 m across a table from rest to a final speed of 1.75 m/s. Find the work done by friction on the textbook.

85. algebra 1

joan builds a deck where the length is three times the width. if the perimeter is 64 feet what is the length of the deck.

86. physics

At the grocery store, you place some produce onto a scale that has a vertically hung spring supporting the produce. The spring has a spring constant of 16 N/m. Your produce bobs up and down with an amplitude of 20 cm, and the maximum speed it reaches is

87. chemistry

why is it unwise to boil the oxolate solution in preparation for it's titration with permanganate

88. Economics

Trade unions and Employer Organisations, Analyse the reasons for their opposition to the new industrial relations laws.

89. sciences

i want to become amember of young scientist association in my school. But for this i must give an idea of any science project . Please help me

90. English

Hi, I am writing an essay about "Disneyfication" of folktales, and I searched for quotes and resources but I didn't find any useful information. I really need help in finding quotes and resources about "Disneyfication" of folktales.

91. Geometry

Determine the distance between A(-1, 2, 3) and B(4, -5, 6) to the nearest tenth

92. Math

Solve: 3^x^2 : 3^x = 9 : 1

93. Macro Economics

Explain carefully the meaning and importance of the term “productivity”

94. Macro Economics

If in 1984, measured GDP in Canada was \$400 billion, and in 1985 it was \$440 billion, explain why we cannot necessarily conclude that the typical Canadian's welfare has improved by 10-percent over the year.

95. math/derivatives

Please compute the derivative for g(x)= sqrt x - 3/x squared. I know the derivative for sqrt x = x ^1/2

96. math/calc

How do I solve for an area under the curve when y = x^2 and solve for above the interval (1,2) ? Any resources where I could see examples would be helpful. Thanks!

97. Math

The radius of circle A is 9 times greater than the radius of circle B. Which of the following statements is true?

98. calculus/derivatives

I need to find the derivative and can't do them when they are raised to powers? Thank You. m(x)x^5 - 5x^3+7x -4)^10 (4x^9 +19)^23 this on is tuff!

99. science

10 name of acid and alkalies and there uses

100. algebra

which of the followings is another root f(x)=x^3-4x^2+14x-20

101. English

Can any one help me with the class foundations of curriculum?

102. Algebra

Paint Express charges \$30 per gallon of paint plus \$1.10 per square foot of wall space. Color Creations charges \$24 per gallon of paint plus \$1.20 per square foot of wall space. Robert estimates he will need four gallons of paint for the rooms he’d like

i need to know the mathematical model for finding the cooling of a hot liquid. and what the letters mean. pls help thanks

104. math

how do you solve by gaussian elimation 2x+y=3 3x-2y=1

105. math

need two words....How can I multiplu if I have groups that are?

106. college chemistry

formt he diluted unknown concentration which i found to be 1.50mg/L i have to calculate the [Fe] in the PRIMARY unknown solution... that is placed in a 250mL volumetric flask

107. Marh

How many 3/4foot pieces of ribbon in 30 feet

108. Algebra

Whatis an "undefinded" matrix? Please give an example.

Determine the intervals where f(x)=e^-x^2/2 is increasing and decreasing

110. Statistics

cant tell if i am on right track for this prababilitly hw assigment help would good! I was recently given a hw assigment dealing with the price is right's "money game". The contestant is shown nine cards on a board. Each card has one pair of numbers. One

111. Math

Given the linear equation 5y = -3x + 19, find (a) the slope of a line perpendicular to the given line. (b) the slope of a line parallel to the given line. A. (a) -5/3 (b) 3/5 B. (a) -3/5 (b) 5/3 C. (a) 5/3 (b)-3/5 D. (a) 3/5 (b)-5/3

112. Math

x + 8 = 0 A) Undefined B) 1 C) -8 D) 0

113. Math

contains (10, -8) with undefined slope A) x = -8 B) y = -8 C) x = 10 D) y = 10

114. Math

complete the ordered pairs x = 2y - 8 ( , 0), (0, ),{ ,1/2} A) (4, 0) , (0, -8),{17/4,1/2} B) (-8, 0), (0, - 4) , {-9,1/2} C) (0, 0), (0, 0), {1,1/2} D) (-8, 0), (0, 4) , {-7,1/2}

115. math

Angle A 45° Angle B 45° Angle C ?

116. Math

which interval notation would go with this equation -5(4x - 14) ≥ -25x + 35 A) {x|x < -7}; (-∞, -7) B) {x|x ≤ -7}; (-∞, -7] C) {x|x > -7}; (-7, ∞) D) {x|x ≥ -7}; [-7, ∞)

117. work

Read the scenario. Use the reference material to assist you in determining what tasks to select for your squad to support the critical tasks identified for the platoon. 1. You are a member of Special Troop Battalion, 3d BCT, 10th Mountain Division. Your

118. critical thinking

Hi Everyone! Please post a substantive response to the following discussion questions by clicking on Reply: Euphemisms: seek to mute the disagreeable aspects of something or to emphasize its agreeable aspects Advertisers, even the media, will use

119. math30

LOGARITHMS AND EQUATION SOLVING Solve for x. Round to the nearest hundredth. 2^(x+3) = 17^(x)