# karen

Newest questions and responses by karen
1. ## Ap Calculus

Find the area of the region bounded by the curves y=x^2-1 and y=cos(x). Give your answer correct to 2 decimal places

2. ## Math

write and solve two subtraction problem that show how many of each animal therw might be. then write the numbersthey are four different kind of animals on the farm there are 19 More cows than sheep there are 19 more ducks than hens there more hens than cow

3. ## Calculus

Given f'(x)=(2-x)(6-x), determine the intervals on which f(x) is increasing or decreasing Options: 1) Decreasing (-∞,2); increasing on (6,∞) 2) Decreasing (2,6); increasing on (-∞,2)U(6,∞) 3) Decreasing (-∞,2)U(6,∞); increasing on (2,6) 4)

4. ## Calculus

A particle moves along the x-axis so that at time "t" its position is given by s(t)=(t+3)(t-1)^3 ,t>0 For what values of "t" is the velocity of the particle increasing? a) 00 d) the velocity is never increasing

5. ## Calculus

Find the absolute maximum value for the function f(x)=x^2 - 3 , on the interval [-4,0) U (0,3]

6. ## Calculus

In the space below, provide the larger of the positive integers that add to 10 and have the largest possible product

7. ## Calculus

If f(x) is a continuous function defined for all real numbers, f(-1)=1, f(-5)=-10, and f(x)=0 for one and only one value of x, then which of the following could be that x value? a) -6 b) -5 c) -4 d) 0

8. ## Calculus

If f is a function such that (f(b) - f(a))/(b-a) =2, then which of the following statements must be true a) f(a) = f(b) =2 b) the slope of the tangent line to the function at x =a is 2 c) The average rate of change of the function on the interval [a,b] is

9. ## Calculus

A gallon rises at the rate of 8 feet per second from a point on the ground 12 feet from an observer. To 2 decimal places in radians per second, find the rate of change of the angle of elevation when the ball on is 9 feet above the ground. Type your answer

2/x+5 - x/x-5 =1 I multiplied both side by (x+5) (x-5) or by x^2 -25 and I arrive at -x^3+x^2+25x-25 =0 And now I am stuck. Thanks for any help

11. ## Calculus

Which of the ff function cannot be expressed in explicit form of dy/dx 4x+4y=2 xy-y^2=1 ycosx=5 My answer is ycosx=5

12. ## Math

Jerry spent 1/5 of his allowance on a book and 3/8 on a book. He remained with \$12.00. Calculate Jerry allowance, the cost of the book and the cost of the pen

13. ## Math

One out of 37 high school ball players play college ball. one out of 22 college players play professional ball. what fraction of high school players play professional ball?

14. ## Chemistry

How much heat is required to convert 9.00 g of water at 100°C into steam at 100°C, if ∆Hvap for water = 40.7 kJ/mol?

15. ## Chemistry

If 4.39 g AlCl3 is dissolved in enough water to make exactly 100.0ml of a solution, what is the molar concentration of the chloride ion?

16. ## science

1. all of the life functions are carried out by cells in a living organisms in order to A. Perform Synthesis B. Maintain Homeostasis C. Keep an Internal steady state D. Both c and d 2. If an -------------------- were digested the product would be

17. ## Science-9

The weight of the nucleus is known as the? atomic mass?

18. ## Chemistry

29.25g of sodium chloride is added to water and undergoes electrolysis according to this equation 2Cl-=Cl2 Calculate the mass of chlorine produced. I am lost with this one !

19. ## Chemistry

Glucose( C6H12O6) is produced by photosynthese. For every kilo of water the plant takes in ,how much glucose can it make ? I done the balanced equation wich is (I think) 6H2O+6CO2 = C6 H12 3O6 After that I get a ratio of 108/372 wich give me a tota of 3444

21. ## Math

I need help, please find the exact value of 2log3 27+log3 (1/3)-log3 3^1/2 many thanks

22. ## anthropology

2 key differentiators and 2 examples of anthropology compared to history and sociology. I found the definitions of each- Cultural anthropology-study of living people and cultures and they actually live with the people they study Archaeology- a subclass of

23. ## Math

A digital clock shows either 3 or 4 digits at a time. What time do the digits have the greatest sum!

24. ## Chemistry

The radius of a magnesium atom is 160 pm & its mass is 4.04 X 10^-23 g. What is the density of the atom in grams per cubic centimeter? Assume the atom is a sphere with: Volume= (4/3)*pi*r^3

25. ## Biochemistry

What is the condensed structural formula of cyclopropane?

26. ## Math

A Texas oil drilling company has determined that it costs \$25,000 to sink a test well. If oil is hit, the revenue for the company will be \$500,000. If natural gas is found, the revenue will be \$150,000. If the probability of hitting oil is 3% and of

27. ## math

what is the effective interest rate of an 8% 13-week treasury bill? assume it is a \$10,00 treasury bill, and round to the nearest hundredth percent

28. ## Statistics

A company makes batteries with an average life span of 300 hours with a standard deviation of 75 hours. Assuming the distribution is approximated by a normal curve fine the probability that the battery will last . Less than 250 hours b. Between 225 and 375

29. ## Algebra 2

E6------E= -0.378eV E5------E= -0.544eV E4------E= -0.850eV E3------E= -1.51eV E2------E= -3.40eV Use the figure shown above to determine how much energy a hydrogen atom with its electron in the E2 energy level must absorb for the electron to be removed

30. ## Math

There is 5 gallons of pineapple juice and I have a six oz glass how many drinks do I get out of the five gallon jar ?

31. ## chemistry

Calculate the concentration of all species in a 0.20 M KF solution.

32. ## Math

What is the approximate circumference if diameter is of 23 feet

33. ## Math

Place parentheses in the expression to make it equal 60? 2×6+6+3×2

34. ## Pre-Calculus

How to solve sin(x/2) = 1 - cos x? I know you would use the half angle identity sin(x/2) = +-(√1 - cos x/2), just don't know what to do from there.

35. ## Pre-Calculus

How to solve sin(x/2) = 1 - cos x? I know you would use the half angle identity sin(x/2) = +-(√1 - cos x/2), just don't know what to do from there.

36. ## Math

when z is divided by 8, the remainder is 5. What is the remainder when 4z is divided by 8. Can you please explain this to me step by step? I'm having difficulty understanding why the answer is 4

37. ## Math geometry

The measure of an angle is twenty more than three times it's supplement. What are the measures of each angle?

38. ## Geography

The distance between station x and y on the map is 7cm. Find the actual ground distance between the two stations if the map scale is 1:100000

39. ## Physics

A table is supported against a wall forming an angle with the vertical. The coefficient of static friction between the table and the floor is (μe). The frictional force of the wall on the board may be neglected. Find an expression for the maximum value

40. ## American Government

Why did the framers insist that federal judges be appointed for a lifetime of service?

41. ## Physics

How long does a car with an acceleration of 2.0 m/s2 take to go from 10 m/s to 30 m/s a. 3 m b. 6 m c. 18 m d. 36 m

42. ## Algebra

The total tickets sales for a highschool basketball game were \$2.00. The tickets price for students was \$2.25 less than the adult ticket price. The number of adults tickets sold was 230, and the number of students tickets sold was 180. What was the price

43. ## Statistics

A random sample of size n is to be drawn from a population with a mean = 500 and sd = 100. What sample size would be necessary to ensure a standard error of 25? Sample sizes are whole numbers.

44. ## algebra

if Sam invested \$10,000 at simple interest, some at 3% and some at 4% and paid \$320 , what was the amount invested at each rate?

45. ## Pre-Calculus

The amount of force required to compress a spring is inversely proportional to the distance that it has been compressed. For one certain spring, it takes 5 pounds of force to compress it from its natural length of 18 inches down to 12 inches. How much

46. ## Stoichiometry

Equation to use Al + Cl2 -> AlCl3 You have 8.6 moles of aluminum, how much in moles of chlorine do you need to react completely? Desperate. Trying to teach daughter on the spectrum and I'm stumped on how to start.

47. ## Math

For every 5 highlighters that Agnes buys , she gets 1 free. If Agnes needs 80 highlighters, what is the least number of highlighters she has to buy?

48. ## Math

Aaron and Ben have a total of 976 trading cards. Ben has 7 times as many cards as Aaron. How many cards should Ben give Aaron so that Aaron will have 3 times as many cards as Ben?

49. ## Math

The temperature at 8:00 a.m. was 46°F. By 1:00 p.m. it was 18° warmer. Which equation would help you figure out what temperature it was at 1:00 p.m.?

50. ## chemistry

The amount of lead in drinking water is 0.025 mg/L. Express this concentration in molality. {molar mass of lead is 207.2 g/mol and the density of water is 1.00 g/cm.}

51. ## chemistry

Molarity material = density x 1000 x (%/100) x (1/molar mass material) 1000 indicates?

52. ## chemistry

How many milliliters of concentrated nitric acid, HNO3, 70 % (wt/wt) are required to prepare 1 liter of 0.250 M solution? The molar mass and density of HNO3 are 63.0 g/mol and 1.36 g/cm respectively.

53. ## Math

The price of a home is 177,000. The bank requires a​ 20% down payment and three points at the time of closing. The cost of the home is financed with a​ 30-year fixed-rate mortgage at 10​%.

54. ## math

A bird beats it's wing 24 times per second. How many times will it beat it's wing in one hour

55. ## Math

A total of 120 students attend top view high school.the ratio of teachers to students is 1:30. Whats the answer

56. ## Math

120 students attend top view high school.the ratio of teacher to students is 1:30.

57. ## Math

During summer vacation, Sanjay writes letters and postcards to his friends at home. A letter costs \$0.41 to mail and a postcard costs \$0.21 to mail. Sanjay writes to 8 friends and spends \$2.08. How many letters and postcards he sends.

58. ## Math question urgent

Mrs. Hart, at age 65, can expect to live for 25 years. If she can invest at 8% per annum compounded monthly, how much does she need now to guarantee herself \$300 every month for the next 25 years? Present Value = 900(1 - 1.0041666..)^-300)/.0041666... =

59. ## Math

Mrs. Hart, at age 65, can expect to live for 25 years. If she can invest at 8% per annum compounded monthly, how much does she need now to guarantee herself \$300 every month for the next 25 years?

60. ## math

Jeremy takes out a 30-year mortgage of 220000 dollars at an annual interest rate of 7 percent compounded monthly, with the first payment due in one month. How much does he owe on the loan immediately after the 87th payment? I have tried 204311.1024, but

61. ## Math

A ship starts at port P, sails 226 deg (T) for a distance of 120 km. 1. How far south of P is it? 2. How far west of P is it?

62. ## physics

you walk 95.0 m at a speed of 1.26 m/s and then run 95.0 m at a speed of 3.61 m/s. what is the average velocity?

63. ## World history

1Which of the following would john locke most favor Republic Oligarchy Theocracy Absolute monarchy 2Whay was james i resistant to working with parliament He believed in the absolute power of kings He did not agree with the policies of the prime minister

64. ## Management Science

For your phone calls, you can either A) buy a prepaid monthly plan, or B) pay as you go. A cost \$50 per month and calls are free up to 8hrs. Any extra min for that month will cost you \$.25. B has a cost of \$.15 per minute. What are the two total cost if

65. ## chem II

calculate the number of moles of solute present in 50.0g of an aqueous solution that is 1.5m NaCl.

66. ## MATH

The Eiffel Tower has a surface area of approximately 76,000 square meters. A restoration company charges \$80 per sq yard for re-painting. How muuch will it cost to paint the Eiffel Tower

67. ## Accounting 220

On January 1, 2014, Muoy Machining Co. purchased a compressor and related installation equipment for \$72,500. The equipment had a three-year estimated life with a \$12,500 salvage value. Straight-line depreciation was used

68. ## Math

Allan gave 5/8 of his money to his son and then gave his daughter 1/2 of the remainder. He kept \$150.00 for himself. How much money did Allan have at the beginning? How much money did his son get?

Explain how the line plot would change if you measure a purple pen that is inches long

70. ## Chemistry

How many millimoles of HCl (aq) are neutralized by 0.35 g of CaCO3 (sol)? mmol

71. ## Statistics

A volunteer ambulance service handles 0 to 5 service calls on any given day. The probability distribution for the number of service calls is as follows: one column has number of service calls (X) those numbers are 0 1 2 3 4 5. The next column Probability P

72. ## Chemistry

Three isotopes of Neon occur naturally: 20Ne (mass = 19.9924 amu) 21Ne (mass = 20.9938 amu) 22Ne (mass = 21.9914 amu) If the percent abundance of 21Ne is 0.2600, what is the percent abundance of 20Ne? How do I set up for these type of problems. I tried

73. ## Chemistry

How do you Find the mass (in g) of Carbon in 2.980 g Carbon dioxide? I saw the question asked before but couldn't find a solution.

74. ## math

Area of a triangle is72cm squared base=12 height=?

75. ## chemistry

A metal tank contains three gases: oxygen, helium, and nitrogen. If the partial pressu of the three gases in the tank are 5 atm of O2, 900 mm Hg of N2, and 1.4 kPa of He what total pressure inside of the tank?

76. ## COLLEGE ALGEBRA

Find the dimensions of a rectangle with a Perimeter of 100 cm - its width is 2/3 its length.

77. ## Chemistry

How many grams of aluminum sulfate are produced if 15.7 g Al reacts with excess CuSO4?

78. ## Check my answers Ms. Sue?

I posted this in my last question but its not showing up for me.. But i have redone the questions you said were wrong and i was hoping you would check them again 1. How did the southern economy change after the Civil War? Shipped raw materials to northern

79. ## World History Check my answers

Okay so i put a star* by each of my answers.

80. ## Chemistry

A 50.0g sample of copper at 10.0 C is placed in 200.0g H20 at 40.0 C in a calorimeter. Heat flows from the water to the copper until both are at 39.3 C. What is the specific heat of copper? (Csp H20 is 4.18J/g*C.) I don't have any idea how to do this

81. ## Math

Two ships leave port at 4 p.m. One is headed N38°E and is travelling at 11.5 km/h. The other is travelling at 13 km/h, with heading S47°E. How far apart are the two ships at 6 p.m.? i am in grade 11 :), studying ahead of the class :) its 8 pm here, this

82. ## math

Two ships leave port at 4 p.m. One is headed N38°E and is travelling at 11.5 km/h. The other is travelling at 13 km/h, with heading S47°E. How far apart are the two ships at 6 p.m.?

83. ## Hunt

Wyatt and Allyson were asked to solve a percent problem using the number 13 and 38. Wyatt found 13% of 38 and allyson found 38% of 13. Explain why they both got the same answer. Would this work for other numbers as well? Why or why not?

84. ## Physics

A 5000 kg truck rear ends a 2500 kg car. Both vehicles applied brakes at the moment of the impact and began to skid. After the impact, the acceleration of the truck is -2 m/s and the acceleration of the car is -3 m/s. If the car skid for 30 m and the truck

85. ## Math

Part A: Max rented a motorbike at \$465 for 5 days. If he rents the same motorbike for a week, he has to pay a total rent of \$625. Write an equation in the standard form to represent the total rent (y) that Max has to pay for renting the motorbike for x

86. ## science

A glass bottle has a volume of 1L and weighs 500g. When half filled with oil, it weighs 1750g. What is the density of the oil in the bottle?

87. ## chem

The mystery compound CxHy is completely reacted with O2 to yield 44 gr CO2 and 18gr H2O. What is the empirical formula of CxHy? I got : C1H2 How much O2 in grams was used in this reaction??

88. ## chem

Assume that the atomic diameter of an atom of element X is 2A and that 1.0 x 10(16th) atoms are arranged in a simple 2D square array. What is the length of each side in cm?

89. ## chem

Consider the unbalanced reaction CO + H2O > CH4 + O2. All reactants in the gas phase. Calculate the H per mole of H2O reacted.

90. ## chem

When balancing the following, what is being reduced, what are the reducing agents, and what is the initial and final oxidation states of the reduction agent? Fe3O4(s) + C(s) > CO2 (g) + Fe

91. ## chem

Fe3O4(s) + C(s) > CO2 + Fe Balance the chemical reaction and calculate how many moles of Fe3O4 must be reacted to produce 440 gr CO2 (the > is an arrow)

92. ## chem

2.0 x 10(exp-13) km/0.01=

93. ## chem

Consider the unbalanced reaction CO + H2O > CH4 + O2. All reactants in the gas phase. Calculate H per mole of H2O reacted. (The > is an arrow)

94. ## Statistics

At the end of the Halloween Festival the organizers estimated that a family of participants spent an average \$45.00 with a standard deviation of \$12.00. What’s the probability that the mean amount spent will be between \$20 and \$30?

Caleb sold boxes of candy. Some sold for \$2, and some sold for \$3. He sold a total of 35 boxes and received \$92. How many boxes did he sell for \$2?

96. ## Distributed Management System

what is the crow's foot ERD of this problem?

97. ## Math

Ryan's average for 5 arithmetic test was 89. On four of the tests he made 96,86,92, and 80. What did he make on the fifth test?

98. ## Math

A recipe or trail mix calls for 1/4 cups of raisins, 1 1/2 cups of granola, 1/2 cup of mixed nuts, and 1/8 cup of chocolate chips. What fraction of each ingredient is required to make 5 1/2 recipes

99. ## Physics

The tortoise and the hare are in a race of 1000m distance. The tortoise travels the entire race at a speed of 2.0 m/s while the rabbit runs the first 200 m @ 2.0 m/s. Then he stops to take nap for 1.3 hrs and awakens to finish the last 800m with an average

100. ## geometry

M is the midpoint of JK. find the coordinates of K. 1. J (-8,4) M (-1,1) 2. J (9,-5) M (5, -2) 3. J (0,11) M (-3,2)