# Questions Asked onMay 15, 2007

1. ## calc

how do you start this problem: integral of xe^(-2x) There are two ways: 1) Integration by parts. 2) Differentiation w.r.t. a suitably chosen parameter. Lets do 1) first. This is the "standard method", but it is often more tedious than 2) You first write

2. ## chemistry

Aluminum reacts with sulfuric acid, which is the acid in car batteries. If 20.0 grams of Al is placed into a solution contain 115 gram of H2SO4, how many grams of hydrogen ga could be be produced? 2Al + 3H2SO4 ---> Al(SO4)3 + 3H2 20.0g/27 = .741 .741 X 3/2

3. ## math

A parabola has the equation y = 4(x-3)^2-7 Choose 2 true statements: A) The parabola has a minimum value B) The parabola has a maximum value C) The parabola does not cross the y-axis D) The parabola does not cross the x-axis E) The vertex of the parabola

4. ## Calculus - Find volume of cylinder

There is a cylindrical tank lying horizontally on the ground, its diameter is 8 feet, and length is 25 feet, the depth of the water currently in the tank is 2 feet. (1 gallon=231 cubic inches) How many gallons of water are in the tank? How many gallons of

5. ## To Kill a Mockingbird

What does the jail in To Kill a Mockingbird represent? the knothole in the tree? the Radley house? Please help with any of these... I'm so confused! http://www.sparknotes.com/lit/mocking/themes.html Scroll down to read about symbols. One of the things

6. ## algebra 1

Can someone solve theses for me? Factor the polynomial x2 + 7x + 12 completely Factor the polynomial x2 – 4 completely Factor the polynomial 18a2b – 4ab + 10a completely x2 + 7x + 12 = (x+4)(x+3) x2 – 4 = (x+2)(x-2) 18a2b – 4ab + 10a = 2a(9ab - 2b

7. ## Trig

sin(2 tan-1 7/24) (that is inverse tangent) Draw a 7 24 25 right triangle. Label the angle whose tangent is 7/24. What is its angle? What is the sin of twice that angle.

8. ## new era public school social studies

ways to protect sun temple konark? materials of which the sun temple konark is made up of? http://www.jiskha.com/search/search.cgi?query=konark Check out several of the answers given here to this same question! =)

9. ## english

That, like dumb mouths, do ope their ruby lips To beg the voice and utterance of my tongue is this a simile? how? Yes. It's a simile. It compares whatever "That" refers to to mouths. It also uses the word "like," making it a simile, not a metaphor. An easy

10. ## chem

HCl is a strong acid and ionizes 100%. NaOH is a strong base and ionizes 100%. We have no way of knowing the pH of HCl + H2O because the problem doesn't state the amount of HCl added or the concentration of HCl. For the NaOH + HCl ==> NaCl + HOH. NaCl in

11. ## chem

Help with this one please? If you place a piece of blue litmus paper in 200mL of dilute hydrochloric acid, the litmus paper turns pink. If you then add 2 drops fo phenolphthalein, the solution remains coloreless. If you add a few drops of dilute calcium

12. ## Chemistry

A 63 gram block of an unknown metal at 88 degrees C was dropped into an insulated flask containing approx. 30 g of ice and 30 g of water at 0 degrees C. After the system had reached a steady temp. it was determined that 12.1 g of ice had melted. What is

13. ## polynomials

lol, i also have these Factor the polynomial x2 + 3x – 18. Which one of the following is a factor? Factor the polynomial 12x2 + 11x – 5 completely. Factor the polynomial 18a2b – 4ab + 10a completely Factor the polynomial 2x2 – 50 completely. Here's

14. ## Managerial ECON

Suppose that during a given year: (1) the price of TV sets increases by 4% in Japan, (2) the dollar depreciates by 5% with respect to the yen, (3) the consumers’ incomes in the U.S. increase by 3%, (4) the price of elasticity of demand for imported TV

15. ## history

Find two Web sites dealing with indigenous cultures and/or religions. Discuss how modern civilization has impacted the spiritual lives of the indigenous peoples you explored. Are the indigenous religions still being practiced today? If so, how have the

16. ## Chemistry

delta G reaction = delta G products - delta G reactants. Hydrogen peroxide is used as a bleachin agent, a disinfectant and medicinally as a topical antibacterial agent. Hydrogen peroxide decomposes according to the reacton 2H^2O^2(l)-->2H^2O(l)+o^2(g) A.

17. ## Chemisty

In titrations of acids and bases, what is the difference between the end point of the titration, and the equivalance point? Also, what is chemically occuring during the buffer zone? Thanks! Good question and one that students sometimes have trouble with.

18. ## physics

A football is thrown horizontally with an initial velocity of (16.5 m/s). Ignoring air resistance, the average acceleration of the football over any period of time is (-9.81 m/s2). Find the magnitude and direction of the velocity at this time and direction

19. ## economics

what do the principles of economics influence your decision making, interaction with others, and the economy as a whole Im not sure what you are asking. Is it "what pricipals of economics affect decision making..." If so, I would use the principals of

http://www.google.com/search?q=netiquette&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA Good stuff in there. =) WHAT IS NETIQUETTE AND WHY IS IT IMPORTANT TO LEARN RULES CONSIDER THE IMPACT OF NONVERBAL COMMUNCATION IN THE

21. ## polynomials

i also have theses to solve Factor the polynomial x2 + 5x + 6 completely Solve the given equation by using the quadratic formula. x2 – 7x – 4 = 0 What value is under the square root (or radical) in your answer? (Note: You are asked to identify only the

22. ## Chemistry

Hydrogen peroxide is used as a bleachin agent, a disinfectant and medicinally as a topical antibacterial agent. Hydrogen peroxide decomposes according to the reacton 2H^2O^2(l)-->2H^2O(l)+o^2(g) A. Given the standard free energy of formation values shown

23. ## economics

How do an economist as a scientist and an economist as a policy advisor help to create understanding of economics? As a scientists, we conduct experiments and do research following the scientific method. (e.g., we observe a phenomena, form a hypothesis,

24. ## Chemistry

Icebergs in the North Atlantic present hazards to shipping, causing the length of shipping routes to increase by about 30 percent during the iceberg season. Attempts to destroy icebergs include planting explosives, bombing, torpedoing, shelling, ramming,

25. ## Economics

Describe the effects of protective tariffs. Why might a government limit free trade in this way? I know that a protective tariff is designed to protect a domestic industry but i can't figure out the rest of the question. Governments impose tariffs on

26. ## Holocaust

what date and year did the Holocaust begin and when did it end? Different experts define the Holocaust in different ways. Some date its beginnings to the start of World War II. The first site below dates the Holocaust from the first day that Hitler became

27. ## Chemistry

X2 + Y2 2XY 0.50 mole each of X2 and Y2 are placed in a 1.0 litre vessel and allowed to reach equilibrium at a given temperature. The equilibrium concentrations of XY is found to be 0.025 mol/L. What is the equilibrium cosntant for this reaction? Do I just

28. ## math

Snell's law of refraction can be written as sin i = n sin r, where n is the refractive index from air to water, i is the angle of incidence, and r is the angle of refraction. In an experiment where a ray of light is directed from air into water, if the

29. ## physics

If the distance between two slits is 0.0620 mm find the angle between the second and third order bright fringe for light with a wavelength of 503nm. Is the answer 0.48? http://www.walter-fendt.de/ph14e/doubleslit.htm Find the angle for the k=2 max, then

30. ## Fractionsss

Thirty-five slices of chocolate cake were sold at the bake sale. If each slice was a tenth of a sake, how many cakes were sold? By dividing each cake into 10 pieces (1/10), you'd need three and a half cakes to get 35 slices.

31. ## Math

How do I figure out this question? Is there a formula I need? For which of the following sets of line segments is it possible to consturct a triangle? 1. Sides of length 17cm, 18 cm,and19 cm 2. Sides of length 11m, 18m, and 6 m 3. Sides of length 46ft,

32. ## Math

I don't get this on if someone can explain it to me Estimate 121% of 600 1.21 times 600 would be the exact figure ok I get 726 I forgot to put the choices here they are.. A) 75 B) 750 C) 72 D) 720 and what i got is not in those choices so what am I doing

33. ## Holocaust research paper

Did more people survive the Holocaust than the amount who have died? At the beginning of the Holocaust, 8 million Jews lived in Europe. At the end of the war, only 2 million were still alive. Please check the many sites that have been posted for you. Thank

34. ## spanish

What is the tourism like in El Salvador? Thank you for using the Jiskha Homework Help Forum. Here are some sites for you to visit: 1. http://www.lonelyplanet.com/worldguide/destinations/central-america/el-salvador 2.

35. ## polynomial

can someone solve this one aswell? ax + 2ay + bx + 2by a(x + 2y) + b(x+2y) = (x+2y)(a+b)

36. ## Algebra

Find the discriminant and solutions for the following equations. #1) 9x^2+6x+1=0 #2) -2x^2+3x-2+0 I will be happy to critique your work. what is b^2-4ac? #1) 9^2-4(6)(1)= 81-4(6)= 81-24=57 so then 57 is the solution but what is the discriminant or is 57

37. ## Macroeconomics

Has anyone ever done a project on Macroeconomics in the Middle Earth? (based on Lord of the Rings?) I need help NOW! What a wonderful idea!! I presume you have read LOTR. You could do the whole middle earth or just a just an area such as the Shire or

38. ## Astronomy

Imagine that you are on a mission to explore a pulsar type star. What will you find there on pulsars and pulsar planets. Using this information, describe what you might encounter on your space mission. Be sure to include references of your sources. Be

39. ## chem

which are electrolytes: ethanol, benzene, CuSO4 A CuSO4 SOLUTION is an electrolyte. Ethanol and benzene do not ionize; therefore, they are not electrolytes.

40. ## chem

what is a liquid solution and a gaseous solution? [define plz] liquid solution: sea water gas solution: air i don't need examples. i need definitions. they are not in my book. a liquid solution is a mixture of atoms/ions/chemicals, etc. dissolved in water.

41. ## biology

what are the factors needed for the growth of bacteria? Since this is not my area of expertise, I searched Google under the key words "bacteria 'growth factors'" to get these possible sources: http://textbookofbacteriology.net/nutgro.html

42. ## History

In creative writing, I need to write a short historical biography by a fictional person. For example, a pioneer, or an Indian when the Pilgrims came. I have to write it from that person's point of view. I chose a soldier in General Grant's army, in April

43. ## grammar

Is it incorrect to say "She is more funny than her sister"? I know you could say "funnier", but is more funny grammatically incorrect? Funnier is correct.... more funny is not correct.

44. ## physics-bobpursley/drwls

Good morning! I just wanted to say thank you for all of your help. This was my first time taking Physics ever and it was like a foreign language to me. For a long time during this semester I had an "F" average, because of you both I have passed my physics

45. ## reputable sources

What would be the most reputable sources I can use? Your most reputable sources for the type of research you are doing will be in books from the library. (Librarians have already sorted out the good stuff from the garbage!) Ask your reference librarian for

46. ## I can write it instead

Leo, a similar prediction is often made about arithmetic since the invention of the calculator. in one of Isaac Asimov writings they discover a man who is actually able to perform an operation like 368 x 4821 with something called a pencil and paper. My

47. ## Chemistry

Do you know how to set up the ICE? That's what you need to do. If you know but are confused, tell us what you don't understand about it. At 55 degrees celcius, the K for the reaction: 2NO2 (g) N2O4(g) is 1.15 Calculate the concentration of N2)4(g) present

48. ## Holocaust

How would I start off my Topic for my research paper? Write an introduction. I searched Google under the key words "research paper introduction" to get these possible sources: http://owl.english.purdue.edu/workshops/hypertext/ResearchW/writeintro.html

49. ## polynomial

can show me how to solve this one?x2 + 4x - 21 = 0 (x+7)(x-3)

50. ## english

Do all authors that write novels are literary writers? For example Hemingway is a literary writer and he writes novels. Will F. Scott Fitzgerald also be a literary writer since he is a novelist? yes. Check a dictionary, either dead tree or online, for a

51. ## Managerial ECON

A researcher estimated the Ep for autos in the U.S. is –1.2, while the Ei is 3.0. Next year, U.S. automakers intend to increase the average price of autos by 5%, and they expect consumers’ disposable income to rise by 3%. A) If sales of domestically

52. ## Science Question

How can you post this under Science? The question is better asked in a grouping of adherents to magic, and fancy. Explain the nature and use of Vril energy. What are some of the potential dangers and drawbacks of the use of Vril energy in modern

54. ## College/Writing

How do i start off writing an letter to a college? what type of things do they want to hear? What is the purpose of writing the letter? Start it off with stating the purpose. We will be happy to critique your work. Can you proofread my letter when i'm

55. ## Astronomy

Imagine that you are on a mission to explore a pulsar type star. What will you find there on pulsars and pulsar planets. Using this information, describe what you might encounter on your space mission. Thank you for using the Jiskha Homework Help forum.

56. ## chemistry(DrBob222)

did you read my previous post? I just want to mke sure understand what the answer is I think it's 1.11 No, the answer is 2.22 grams. 1.11 is the number of mols H2 which you calculated correctly. Then you converted 1.11 mols to grams by 1.11 mols H2 x molar

57. ## science

does methane have anything to do with ozone depletion? http://www.ciesin.columbia.edu/docs/011-466/011-466.html What Drainage basin does Michigan belong to? I have answered this one a couple of times already. Can I direct you to the statement in the

How should this sentence be hyphenated? As the number one credit union owned and operated EFT network and processor in the country, ... Since this is not my area of expertise, I searched Google under the key words "hyphenation" to get these possible

59. ## geogry

Where is the white house? 1600 Pennsylvania Avenue, Washington, D.C.

60. ## Debate.

I'm needing opinions right now. This is probably one of the stupidest topics (in my opinion) that we've discussed on our debate team, but the argument sparked between the teacher and I. We were talking about people bringing pills to school, and there was

61. ## Math

BASIC MATHEMATICS MAT/115 I have this problem and it is my last one and I can not figure it out can someone help me the question is. Find the missing length of the right triangle, 7,25 it is a scalene triangle I have been fighting with this problem for the

62. ## Architecture Question

It looks as if what you need to do is learn how to conduct thorough and effective searches for yourself. That's what research is, and I'm sure that's what your teacher expects you to do -- conduct research. You are searching for information that is so

63. ## typing my research paper

If I am a slow typer and my research paper is due tommorow when I started researching about 3-4 weeks ago. How can I finish by tommorow? I only have my works cited page ,title page,and 3 body paragraphs. Don't waste time posting messages when you should be

64. ## algebra

Okay, how do you factor a polynomial when there is a number in front of the highest x term. For example: how would you factor 2x^2-11x+15 i know the answer is (2x-5)(x-3), right? So you put the 2x on one side and then you put an x on the other. And then

65. ## research

What year did the Holocaust begin?when did it end and how? I've already answered that twice in the last day or so on this board. Please look back on all of your posts and their answers. If you don't want to read the answers you get on this board, fine. But

66. ## science

What is on pulsars and pulsar planets. Using this information, describe what you might encounter on your space mission. Thank you for using the Jiskha Homework Help forum. Rather than my posting an entire page of sites, please go to the following, which I

67. ## simple question! i sware!!

Can you tell me how the number twenty-eight (28) is in everyday life? Or in other words where can you find it in everyday life? thank you! i don't need a website just give me an idea... thanks! Look at the calendar. help.. I got that already but thanks

68. ## IT

What skills are needed to perform the business functions of computer operations? I am assuming they are needing more than the basic function like keyboard and on and off but not sure what that would be. I tried to think of what i needed to know if i had an

69. ## astronomy

what do scientists and public say about Pluto these days? Since this is not my area of expertise, I searched Google under the key words "Pluto planet" to get these possible sources: http://news.nationalgeographic.com/news/2006/08/060824-pluto-planet.html

70. ## Geography

My question is Why is Milan cooler than Palermo although Milan is in the North and Palermo is in the south of Italy Does rain fall got to do with it cause Milan has the most rain fall Milan:

71. ## History

What can be a soultion to the issues facing India for example Nulclear Tension with Pakistan and Feeding a population of over 1 billion people? Make friends. Quit fighting over wasteland to the North. Figure out what the citizens want, and make it happen.

72. ## Math+ confused?!

I had to solve for this: 1) choose 4 people from a class of 12 My answer: n=12 r=4 12C4 = 495 2) chosse 8 people from a class of 12 my answer: n=12 r=8 12C8 = 495 why is it that they both eqaul 495? maybe I am doing it wrong but I am confused why do they

73. ## health

how do child abuse programs reflect the scientific theory and human disorders theory? Which "scientific theory and human disorders theory" are you referring to? We need more specific data to provide help. Please repost, and we will do our best to help.