1. Chem 2

4) Calculate the solubility of calcium hydroxide, Ca(OH)2 (Ksp = 5.5 x 10-5) in grams per liter in: a. Pure water b. 0.10 M CaCl2

2. algebra

The table below gives the value of a car over two years. Using an exponential best-fit model, after how many years is the car valued at 25% of the original value? Year 0 0.5 1.0 1.5 2.0 Value (\$) 15,500.00 14,560.00 13,911.20 12,969.66 12,204.09

3. science

two point charges of 5 micro culomb and 20 micro culomb are separated by a distance of 2m find the point on the line joining them at which electric field intensity is zero

4. physics

A 900kg car strikes a huge spring at a speed of 22m/s, compressing the spring 4.0m How long is the car in contact with the spring before it bounces off in the opposite direction? I found the spring constant to be 27225, which i know is right, but am having

5. geometry

A rectangle is 14cm wide and 48 cm long. Find the measures of the acute angle between its diagonals. please help

6. Chemistry

Using Hess’s Law with the following data: N2(g) + O2(g) = 2NO(g) Del(H) = 180.7kj 2NO(g) + O2(g) = 2NO2(g) Del(H)= -113.1kj 2N2O(g) = 2N2(g)+ O2(g) Del(H)=-163.2kj Calculate Del(H) for the reaction: N2O(g) + NO2(g) = 3NO(g)

7. Geometry

Crazy hard question I don't get: "A sphere with radius 3 is inscribed in a conical frustum of slant height 10. (The sphere is tangent to both bases and the side of the frustum.) Find the volume of the frustum." I need a proof for this, and I don't know

8. Chemistry

Calculate the standard enthalpy change for the following reaction at 25 °C.? 2CH3 OH(g) + 3O2(g) -------- 2CO2(g) + 4H2O (g)

9. physics

A small rock passes a massive star, following the path shown in red on the diagram above. When the rock is a distance 4e+13 m (indicated as d1 on the diagram) from the center of the star, the magnitude of its momentum p1 is 1.1e+17 kg ·m/s, and the angle

10. math

A specially made pair of dice has only one- and two-spots on the faces. One of the dice has three faces with one-spot and three faces with two-spot. The other die has two faces with one-spot and four faces with a two-spot. One of the dice is selected at

11. Geometry

The total area of all the faces of a rectangular prism is 22, and the total length of all its edges is 24. Find the length of the internal diagonal of the prism. Thank you!

12. Chemistry

how would you prepare 250 ml of 0.69m al2(so4)3 solution from a 2.0 al2(so4)3 stock solution

13. Math

Suppose you own a tour bus and you book groups of 20 to 70 people for a day tour. the cost per person is \$30 minus \$0.25 for every ticket sold. Gas and other miscellaneous costs are \$200. Part a) Write the revenue and cost functions for this situation Part

14. chemistry

You have a 1.0 M stock solution of H2SO4 in a large flask. You need to dilute this to make a 0.25M solution of H2SO4 for an experiment. If you need exactly 100.0mL of the diluted solution, how would you make the diluted solution?

15. To Ms. Sue

Ms. hi! I would like you answer for me one question that I just don't get it from my English homework and if you can explain me what is a subject-verb agreement in a simple way maybe a tip or something in order that I learn how to figure it out by myself

17. public speaking

1. “To persuade my audience that drinking and driving laws should be stricter” aims for: A. passive agreement with a policy. B. active agreement with a policy. C. personal action to support a policy. D. personal agreement to support a policy.

18. Finite Math

suppose x sheets from a 500 sheet ream of paper have been used. Write an algebric expression to represent the number of sheets that are left

19. electric circuit

Some types of fuses used to protect electric meters have resistances of several ohms. Is this objectionable (a) in ammeter circuits and (b) in voltmeter circuits? Why?

20. Trigonometry

A plane flew 150 miles on a course of 220 degrees and then 130 miles on a course of 130 degrees. Then the plane returned to it's starting point via the shortest route possible. Find that shortest distance.

21. PUBLIC SPEAKING

One of the primary jobs of an informative speech is to: A. appeal to the emotions of the audience. B. ask them to do something with the information. C. communicate information accurately and clearly. D. entertain the audience.

22. math

1. Read the following statements: I. All trapezoids consist of two parallel sides. II. The base angles of all trapezoids are equal in measure. III. The lengths of the tall trapezoids legs are equal in measure. Which of the above statements are true? II

23. SAT WRITING

Please give me a score of 1-6 (one being poor and six being excellent). Also, please give me some feedback! Thank you in advance! Essay prompt: What motivates people to change? Essay: Many people know that eating junk food is unhealthy. Yet, they keep

25. math

A school booster club is selling T-shirts. The silk screening company is selling shirts to the boosters for \$3 each, plus a one-time fee of \$150 to cover supply costs. If the boosters want to make at least \$300 in profits and they sell a shirt for \$12, how

26. public speaking

2. “To persuade my classmates that cheating in an exam is just as wrong as plagiarism” is a: A. question of fact. B. question of policy. C. question of value. D. question of guessing.

27. Writing

Please give me a score of 1-6 (one being poor and six being excellent). Also, please give me some feedback! Thank you in advance! Essay prompt: What motivates people to change? Essay: Many people know that eating junk food is unhealthy. Yet, they keep

28. Physics

Why should a voltmeter have a hisg resistance? How should a voltmeter be connected to the componenets of which the voltage is being measured.

29. PreCalculus

Solve for x. sec(x)sin(x)=2sin(x) 0

30. Chemistry

A 30.00 mL sample of 0.1500 M hydroazoic acid (HN3; Ka = 1.9 x 10-5) is titrated with 0.1000 M KOH. Calculate the pH after the following volumes have been added: a. 0.00 mL b. 11.25 mL c. 22.50 mL d. 33.75 mL e. 45.00 mL f. 56.25 mL

31. English

Could you help with the punctuation on this paragraph please! Therefore,supporting the fact that you can dress a diverse group of students one way, but they would not all believe or view things the same way. If there is a standard in place, then it would

32. math

Sue left her home at 6 A.M. driving her car at the rate of 50 miles per hour. At 8 A.M. her brother Kevin drove after her along the same highway, traveling at the rate of 60 miles per hour, in how many hours did Kevin pass Sue.

33. English 2

Expand each sentence below by adding words or phrases that modify the nouns. The questions below each item suggest details you can add. 1.People hook up machines to their telephones. What kind of people use machines? What kind of machines are used?

34. English 2

Expand each sentence below by adding words or phrases that modify the nouns. The questions below each item suggest details you can add. Messages request information. What kind of messages are heard? What information is requested?

35. Calculus

Find the scalar equation of a plane that is perpendicular to plane r=(-2,1,3)+s(0,1,1)+t(-1,0,3) and also intersects it along the line (x-3)/2=(y+1)/-3,z=1

36. Algebra

For nonzero numbers x,y, and z, 3x=4y and 12y=5z. What is z/x?

37. Math

Find an equation of the curve that satisfies the given conditions: (d^2y/dx^2)=6x, the line y=5-3x is tangent to the curve at x=1

38. calculus 2

use the simpsons rule with n=10, arc length y=^3sqaure root x, for 1

39. trigonmetry -math

cos2acos2b + sqr(sin(a-b)) - sqr(sin(a+b)) = ?

40. buisness statics

Mean yearly salary of employes of a company wasRs20,000.mean yearly sakaries of male and female employes were Rs 20,800 and 16,800.find out the percentage of male and female employed by the company??b

41. Math

Let R be the statement : for all sets A, B and C, if A⊆B∪C and B ⊆C∪A then AΔB = C. Q: Is R true for all sets A, B and C? Prove answer Let S be the statement: for all sets A, B, and C, if AΔB = AΔC then B⊆C. Q: Is S true? prove answer Thanks

42. maths lit,life science,economics,history

what career must i follow

43. us history

I was wondering if somebody can help me improve on my answers to these questions below. Thank you. One Explain the evolution of Cold War liberalism between 1945 and 1968, that is from the presidency of Harry S. Truman through John !@#\$%^&ennedy and to

44. geometry

A bachelor spends one half of his salary on entertainment,one fifth on food,one tenth on clothes and one fifth on rent.What fraction of his salary is left?

Light travelling in water is incident on air refracts at an angle of 27 degrees. What is the angle of incidence? my answer: 37 degrees

46. physics

light travelling in air is incident on a soap bubble. If the path difference through the soap bubble is 2.5λ: a) constructive interference will occur b) destructive interference will occur c) partial interference will occur d) none of the above

47. Math

Let R be the statement : for all sets A, B and C, if A⊆B∪C and B ⊆C∪A then AΔB = C. Q: Is R true for all sets A, B and C? Prove answer Let S be the statement: for all sets A, B, and C, if AΔB = AΔC then B⊆C. Q: Is S true? prove answer Thanks

48. Math

Two trains are travelling on parallel tracks both going from station A to station B.Train 1 leaves at 8 am, at 65 miles per hour. Train 2 leaves at 10 am, at 90 miles per hour. At what time will train 2 catch up to train 1?

49. Calculus

State the cartesian equations of two lines that make angle of 60 degrees with the line r=(1,3)+s(1,1)

50. Math

At a speed of 48 miles per hour, how mnay minutes will it take to drive 40 miles? Is it 32 minutes?

51. English

Hi, I need help with MLA citing. This is just an example paragraph but please tell me if Im citing correctly : Tom was sad. Howard states," Tom leaned over the table with disappointment" (Howard 23).

52. Math

solve the following system of equations using matrices 4x-2y=7 7x+y=13

53. phi

How would the Kantian moral theory apply in resolving the negative effects on a community? (Points : 1) By treating persons in the community as ends in themselves, then companies will strive to provide quality products as well as to remedy any negative

54. PHYSICS

WHAT DOES A DISPLACEMENT-TIME BALLON GRAPH REPRESENTS?

55. Chemistry

According to the experiment procedure, given that the NaOH solution has a concentration of 0.100M, and that the vinegar (acetic acid) has a concentration of 5.0%m/m (mass percent), what volume(mL) of titrant would be required to reach the "equivalence

56. math

27 root 3 =3^b. Find the value of b.

57. math

what are the factors of x^2-6x+12?

58. math

Show that 4/2^x = 2^2-x and hence or otherwise solve for x in the equation 2^x +2^x-2 =5

59. bussiness math lit and tourism

What university and job can I get

60. mathematics

125,454 dollars take 30% how much is left

61. us history

I was wondering if somebody could help me improve on my answers to these questions below. Thank you. One: Despite Watergate, did not Richard Nixon's presidency start the Republican ascendency of the following period? Why and how did this happen? -1. Yes it

62. Algebra

please help me with this question. please explain this question to me and how you got the answer to the question. Solve the inequality. > 10 A. y < –16 B. y > –60 C. y > 4 D. y < –60

64. Algebra

please help me and explain how you got the answer. Solve the equation. y + (–6) = –9 A. –15 B. –3 C. 54 D. 3

65. English 2

Expand each sentence below by adding words or phrases that modify the verb. Questions after each item suggest details you can add. A French girl found them. Who was with the girl? In what time period did she find them?