1. Chemistry!

When 2.5g of NaOH were dissolved in 49.0g water in a calorimeter at 24.0 C, the temperature of the solution went up to 37.1 C. a. Is the solution reaction exothermic? Why? The temperature or the water went from 24.0 to 37.1 which is an increase. If the

2. Econ.

In recent years, some policymakers have proposed requiring firms to give workers certain fringe benefits. For example, in 1993, President Clinton proposed requiring firms to provide health insurance to their workers. Let’s consider the effects of such a

3. Economics

6. Show the effect of each of the following events on the market for labor in the computer manufacturing industry. Use graphs. a. Congress buys personal computers for all American college students. Wouldn't the demand curve shift to the right while the

4. Urgent-Chemistry Help

I need help with the heat effects and calorimetry worksheet. Please explain how to solve it! Thank you so much! A metal sample weighing 45.2g and at a temperature of 100.0 C was placed in 38.6g of water in a calorimeter at 25.6 C. At equilibrium the

5. Economic

Suppose that labor is the only input used by a perfectly competitive firm that can hire workers for \$50 per day. The firm’s production function is as follows: Days of Labor/Units of Output: 0/0, 1/7, 2/13, 3/19, 4/25, 5/28, 6/29, 7/29 c. Compute the

6. Economics

hey...i had a similar econ question..check out schoolpiggyback (search it on google)...it'll help ya out...its other students that answer your question (maybe someone from your class...lol)...goodluck : ) 3. A large share of the world supply of diamonds

7. Math I really need help!

http://www.jiskha.com/display.cgi?id=1165286122 A group of students decided to look at rectangles that are spuare. They find that no matter what size square they drew, every square was similar to shape B in the Shapes Set and to all other squares. They

8. Math HElP!!!!!!!!

A group of students decided to look at rectangles that are spuare. They find that no matter what size square they drew, every square was similar to shape B in the Shapes Set and to all other squares. They found that all squares are similar! They decided to

9. History

These sites should have what you need: http://www.answers.com/topic/xyz-affair http://www.u-s-history.com/pages/h465.html The xyz affair caused what problems for the president John Adams?

10. Physics

Archimedes principle. The weight of the bouy is given, so the weight of water displaced by the submerged part of the bouy equals that. Figure the volume that weight of water displaces, then figure the height of a .33m diameter column of water will have of

11. Calculus

The rate of growth of the profit (in millions of dollars) from a new technology is approximated by P'(x)=xe^(-x^2) Where x represents time measured in years. The total profit in the thrid year that the new technology is in operation is \$10,000. A. Find the

12. physics

what kind of force field surrounds a stationary electric charge? What additional field surrounds it when it moves? "what kind of force field surrounds a stationary electric charge?" Electric field. "What additional field surrounds it when it moves?"

Suppose a publishing company has found that the marginal cost at a level of production of x thoudsand books is given by: C'(x)=50/sqrroot(x) and the fixed cost is \$25,000. Find the cost function C(x). C= INT C'= INT 50/sqrtx= 100 sqrtx + F where F is the

14. Physics

A wheel has a coonstant rotational acceleration of 3.0 rad/s^2. During a certain 4.0 s interval, it turns through an angle of 120 rad. Assuming that the wheel starts from rest, how long is it in motion at the start of the 4s interval. I just need help in

15. physics

A heavy flywheel rotating on its central axis is slowing down because of friction on its bearings. At the end of the first minute of slowing, its rotational speed is 0.90 of its intial rotational speed of 250 rev/min. Assuming a constant rotational

16. calculus

It is estimated that x years from now, the value V(x) of an acre of farmland will be increasing at the rate of: V'(x)= 0.4x^3/sqrroot(0.2x^4+8000 dollars per year. The land is currently worth \$500 per acre. A. Find V(x) b. How much will the land be worth

17. chemistry gas laws

In a science demonstration, 4 to 6 plastic garbage bags are arranged under a 2 m by 2 m piece of plywood. A volunteer stands on the plywood and others blow into the bags to "levitate" the volunteer. If four bags are used and a 140 lb person is on the

18. Statistics

Find the probability of correctly answering the first 2 questions on a multiple choice test if random guesses re made and each question has 6 possible answers. My answer is 1/36 Assume that the data has a normal distribution and the number of observations

19. chemistry

I have two Questions I need help with. 1. Why do some combinations of ionic compounds form a precipitate while other ionic compounds don't? AND 2. Solutions of lead(II)nitrate and potassium iodide are combined in a test tube and form a yellow precipitate.

20. History

Why were federalists shocked by adam's decision to resume peace talks with the french?

21. Probability

If you pick a card at random from a well shuffled deck, what is the probability that you get a face card or a spade? a) 3/26 is that correct In one town, 336% of all voters are Democrats. If two voters are randomly selected for a survey find the

22. math/Check!

a. An ellipse is formed by stretching the graph of x^2+ y^2=1 horizontally by a factor of 3 and vertically by a factor of 4. Determine the equation of the ellipse in standard form x^2/a^2+y^2/b^2=1 (x/3) ^2+ (y/4) ^2=1 x^2/9 + y^2/16 =1 so the equation is:

23. math, algebra

Can someone check this for me : Find the gcf for each of the following groups of numbers: 36,64, and 180 My answer: gcf=4 Find the lcm for each of the following groups of numbers which ever method you wish:8,15, and 20 My answer: Lcm=1 Find two factors of

Suppose the marginal profit from the sale of x hundred items is: P'(x)=4-6x=3x^2 and the profit of 0 items is -\$40 A. Find the profit function. B. Find the profit from selling 800 items I assume the P' is 4-6x+3x^2 Then P= 4x - 3x^2 + x^3 + C where C is

25. algerbra

mrs. johnson is 3 times as old as her son. ten years agoe she was 5 times as old as her son was then. what is the two equations for this problem? let x = son's age and y = Mrs. Johnson's age. ============================ y=3x is one equation. 10 years ago

Suppose the marginal revenue (in dollars) from the sale of x jet planes is R'(x)=2x(x^2+50)^2 A. Find the total revenue function if the revenue from 3 planes is \$206,379. B. How many planes must be sold for revenue of at least \$450,000?

27. Calc Jacobian

Thanks "I know that the xy region is the line x=y y=0 and y=1- x/2)" It is helpful to rewrite the region in the x-y plane by specifying the three lines and the endpoints, i.e. the points where they intersect. If you insert these points in the formula for U

28. someone please chek my math!

a. An ellipse is formed by stretching the graph of x^2+ y^2=1 horizontally by a factor of 3 and vertically by a factor of 4. Determine the equation of the ellipse in standard form x^2/a^2+y^2/b^2=1 (x/3) ^2+ (y/4) ^2=1 x^2/9 + y^2/16 =1 so the equation is:

29. chemistry

CH3CCH IN LEWIS DOT DIAGRAMS FNO,N2H4,PCL5,CH3OH,OH-,LiOH,NO-2,NO2,HNO3,CH3CHO,IF3,Asf3,SO2-3, H2SO4,XeO3 Dot diagrams are almost impossible here in text, with hard carriage returns. Sorry.

30. Writing Class

Can someone give me some ideas on what to narrow my research topic to? My topic is animal testing. My paper has to be 2,000 to 2,500 words including my references. Thanks :) What about eye testing drugs? That is done a lot, and appears to have no

31. math,algebra,bobpursley

Let me know if this is correct now: (1)Finding the lcm using which ever method for:5,15 , and 20 8:2x2x2x3x5x5 15:2x2x2x3x5x5 20:2x2x2x3x5x5 --------------- LCM:2x2x2x3x5x5 After simplification LCM:120 (2)Find the GCF for each of the following numbers: 36,

32. superlatives

I was told that at one time the superlative "worst" was not correct. It used to be "bad worse worse"rather than "bad worse worst". Is this true? If so, when did the change take place? Thank you. Thank you for using the Jiskha Homework Help Forum. 1. First

33. World History

Wow! Thank you very much! Do you have any ideas about the items I listed at the bottom which I am not sure how to incorporate. And, does my opening paragraph reflect an analytical thesis? Do I discuss, describe, evaluate and show in my paper? Is it logical

34. history

why is the northwestern corner of minnesota not canada The gents formulating the Treaty had a lousy map. http://en.wikipedia.org/wiki/Northwest_Angle

35. Science

What is a Chemical property? What is a Physical property? -thanks Usher and im not the singer..... http://www.onelook.com/ Type in chemical property, then, do it again with physical property.

36. chem

why do good oxidizing agents easily reduce? Good (strong) oxidizing agents are easily reduced. What you said I think differs slightly from that. If they are strong oxidizing agents, they easily oxidize other ions and in doing so the oxidizing agent is

37. English-- literature

Cyrano de Bergerac: (you don't really have to have read the book) I have to think of contemporary (modern day) parallels (ie: crimes, political, entertainment, or gossip column news, advertisements, etc.) for each of these characters or events: (I've been

38. science

how do you do a powerpoint for a biodiversity museum exhibit. I need to do a presentation. Are you making one or visiting one? Are you in need of info on how to use PowerPoint, or what to say? If the latter, be more specific. We cannot prepare

39. MATH/ Check?

Correct. what is pi The definition or the number? The number is 3.14159 but that isn't an exact number. pi doesn't have an exact number except by definition and that is in words and not a number. The ellipse in question above( is translated 4 units to the

40. To sam!

Was the five part unknown question for compounds A through E yours? If so, did you get it answered ok? no it was not mine! can you please check my math? can you please check my math?

41. writing

i areleay need help http://www.angelfire.com/wi/writingprocess/ http://leo.stcloudstate.edu/catalogue.html http://www.arts.uottawa.ca/writcent/hypergrammar/paragrph.html (Broken Link Removed) These sites can help you generally. If you have a specific

42. Math Word Problem

Todd has indigo, yellow, pink, and red flowers in his green house. The ratio of indigo flowers to yellow is 3 to 5. The ratio of yellow to pink is 2 to 4. The ratio of indigo flowers to red is 2 to 5. There are 6 indigo flowers. How many flowers of each

Evaluate each indefinite integral. Use the substitution method. X square root (x+3) dx

44. History

How did the xyz affair divide the two political parties?

45. chemistry

CH3CCH IN LEWIS DOT DIAGRAMS OK. Move the two top electrons on carbon 2 to carbon 3 and do the same for the two lower electrons on carbon 2. Move them to carbon 3. I'll see if I can do that but you see how difficult it really is.

46. science

consumer science or chemistry What is the field of science if I am dealing with the problem which detergent works the best?

47. Math

How many different three-digit numbers can be written using the digits 4, 5, 6, and 7? Use each digit only once in a number. Is the answer---24 different 3-digit numbers? I did this the long way--Is there a short equation to use for this? Thank you! You

48. Beorstone

Why does walter love his peaches so much He does not love his peaches, he is only shaking his tree to make them fall, but his actions are misinterpreted for narcissism.

49. CHEMISTRY

what is the symbol for chromium (II) sulfate? You mean the formula? CrSO4 yes! thanx!!!!!! do u know how to find the number of molecules or atoms in a mole? The number of atoms in a mole is called Avogadro's number, the value of which is approximately 6.02

50. economics

Which combination of fiscal policy actions would be most stimulative for an exonomy in a deep recession? a) increase taxes and government spending b) decrease taxes and government spending c) increase taxes and decrease government spending d)decrease taxes

51. precalculus HELP!

I posted this question before: What is the area enclosed by the graph of the absolute value(3x)+ the absolute value(4y)=12 I tried solving for y and got: y=4-x when I graphed this, I got a linear equation graph...I am wondering if I am supposed to find the

The research department for a hardware chain has determined that at one store the marginal price of x boxes per week of a particular type of nail is: p'(x)=-4000/(2x+15)^3 Find the demand equation if the weekly demand for this type of nails is 10 boxes

53. math

how do you solve this type of math problems that indicates to perform the indicated operations for 3 and 3/4 divided by 1 and 3/8 convert the whole numbers into fractions. 3 3/4 = 15/4 1 3/8 = 11/8 to divide 15/4 by 11/8 invert the denominator and

54. Math

The kingston parks and recreation dept. is planning a new that will be 100 yards long and 85 yards wide. The dept. recommended that the trees be planted along the perimeter of the park at equal distances from each other and as far apart as possible. How

55. Statistics

1) No, 8.0 is the correct answer. 2) a strange and unlikely probability distribution. But lets go with the stated parameters. It states that ZERO percent of the population loses less than 6 lbs OR more than 12 lbs, but exactly evenly distributed between 6

56. math - exponents

help! (2^20/2^17)^3= (3y^6)(8y^-3)= (4a^3y^-4/2a^5y^-7)65= I will do one: you need to review the rules. (2^20/2^17)^3= (2^[20-17])^3= (2^3)^3= (2^9) = calculator

57. social studies

what are the qualities of a good socialstudies? HOW ARE The textbook used by the teacher? Opinions vary. And it depends on the course, and the age of the students, and the IQ level of the students (AP, regular, or less). My own use of texts has a history

58. math/ confused!

What degenerate form or forms of the parabola CANNOT be obtained from the intersection of a plane and a double napped cone? I have to use a diagram and give complete description how to obtain this ( or these) form(s) how would I do this question

59. Psychology

hey..check out schoolpiggyback (on google)...they got psychology students that will answer your questions there...neways..goodluck : ) Psychologists have used four perspectives in their efforts to explain motivation. These include an emphasis on instincts,

60. Mathematics question

It was...the subject is FOILs,I thought we needed to put what we were doing in the subject... Subject area needs to be properly stated. This is not FOIL. That is multiplying of two binaries as in (a+b)(c+d) Here you are to factor. take the first:

61. Math: matrices

If A and B are both square n x n matrices, If AB = I, prove BA = I Presumably you have to do this without using the usual properties of the inverse of matrices. But we do need to use that if there exists a matrix B such that A B = I then the equation A X =

62. Science

I need help with types of levers. How can you tell the difference between first class second class ect. ect. http://en.wikipedia.org/wiki/Lever

63. science

What would be a good title for the project which detergent works the best? Effectiveness of Detergents

65. MATH

How do you write fractions in simplest form? for example I need explanation 48/66 Also I started on another one it states that I have to multiply. and I have to be sure to simplify each product 7/9 x 3/5 My answer: 21/45 I just don't know what goes after

66. science

plz help me!!!!! what are morels in biology???? are they fungi,bacteria,or something else they are a fungus, delicious too :)

67. world history

What are some good sites to use as a resource in writing a paper which would discuss two revolutions i.e. french revolution, etc.? American Revolution http://www.loc.gov/rr/program/bib/ourdocs/NewNation.html http://www.pbs.org/ktca/liberty/

68. Science/Nutrition Information

Does the egg white have more protein or the egg yolk (yellow part of the egg) have more protein? http://nutrition.about.com/od/askyournutritionist/f/eggwhite.htm

69. ART

For an art project, I have to try and find an artist(preferably famous- so that i can find information on him/her)that draws/paints buildings. As i am having trouble finding one. Thank you if you can help! Thank you for using the Jiskha Homework Help

70. calc

correction: 9/25(u+7)u^11 du = 9/25(u^12 + 7 u^11) du and you can easily integrate this indefinate integral of 9x(5x-7)^11 dx using the u substitution method: i know u= (5x-7) but when i use this the x in the 9x doesn't cancel thus x= (u+7)/5. however when

71. English

In shakespearian language, thou=you so how would you say, "I." I Shakespeare also used "you" often. Answering your question, the first person would be I, and plural, we. http://www.cummingsstudyguides.net/xThou.html

72. Powers!

1. Should be 8a15 but I think that is just a typo because the * and 8 are on the same key of the keyboard. 2-4 look ok to me. 5. What you have looks ok to me; however, can't these two terms be multiplied to give 200x8y9 ? Yeah sorry about #1 that's what I

73. grammar

was wondering if you can help me correct these following sentences: focus is on glossary usage. 4. I use to be a philosopher, but now my brain works as it should. 5. "Woe is I," Kierkegaard shouted as he jumped off of the cliff with alot of nonbelievers.

74. No Subject. This is a Thank You to Mr. Pursely

Thank You so much for all of your help. I really needed it.

75. math

Simplify: 6x+3y/3 Divide the denominator three into each of the numerals in the numerator, it reduces.

76. Current Events

I nedd help finding articles about Supranationalism, Devolution, The European Union, North Atlantic Treaty Organization(NATO)and Gerrymandering that are within November 29,2006 It looks as if what you need to do is learn how to conduct thorough and

77. Economics

For the following characteristic say whether it describes a perfectly competitive firm, a monopolistically competitive firm, monopoly firm, or neither. Equates marginal revenue and marginal cost I would think that it would be each one of them since each

78. social studies- articles of confederation

true or false that money in one state was different for money in another state? true each state got to pick there desins

79. math

Is there anywher i can go for further explanations on how to solve for the following statements on how to solve them: Dividing writing each result in simplest form & adding & subtracting I searched Google under the key words "fractions divide add subtract"

80. SCIENCE

WHAT IS THE PART OF AN EXPERIMENT THAT IS NOT BEING TESTED AND IS USED FOR COMARISON control group