Questions Asked on
May 27, 2007

  1. Matrix

    Let A be an invertible n x n matrix, and let B be an n x p matrix. Explain why (A^-1)(B) can be computed by row reduction: [A B] ~...~ [I X] X=(A^-1)(B)

    asked by Jen
  2. music

    how do you draw a clef before each of these notes to make the letter name correct? Thank you for using the Jiskha Homework Help Forum. We need to see WHICH notes!

    asked by shenell
  3. chemistry

    which of the following compounds contains the lowest percentage by mass of nitrogen? 1) NH4NO3 2) (NH4)2 SO4 3) NaNO3 4) NH3 can someone please help me??what method should i use?how do i do this? Find the molar mass of each compound by adding the molar

    asked by Emma
  4. science

    why does a soda explode in a cold car? How do you define "cold"? What type of container are you referring to? Were you in the act of opening it? Since this is not my area of expertise, I searched Google under the key words "'soda water' explode," but I

    asked by sam
  5. History

    What was the Johnson's Administration policy on civil rights? Are you referring to President Andrew Johnson or President Lyndon B. Johnson? It makes a difference. There are articles in here about both presidency's -- be sure to differentiate:

    asked by Haylee
  6. chemistry

    liquids such as ethanol have a greater vapour pressure than water for any given temperature. comment on the strength of the intermolecular forces in ethanol compared to water.

    asked by Emma
  7. Chemistry

    How does Boyle's Law apply to our breathing process? Since this is not my area of expertise, I searched Google under the key words "'Boyle's law' breathing" to get these possible sources: http://library.thinkquest.org/12596/bonus_boyles.html

    asked by Stacie
  8. chemistery

    how does the atmosphere change at high altitudes? Since this is not my area of expertise, I searched Google under the key words "atmosphere altitude Earth" to get these possible sources: http://en.wikipedia.org/wiki/Earth's_atmosphere

    asked by sam
  9. biology 12

    is there chromosome replication in mitosis? i know theres one in meiosis, im just not sure for mitosis. Yes See: http://www.uic.edu/classes/bios/bios100/lecturesf04am/lect16.htm and scroll down to: Mitosis in a Nutshell

    asked by Matt
  10. Math

    Jerry earned $18,500 one year and then received a 10.5% raise. What is his new yearly salary? would this be the correct way to set this up and the correct answer? $18500*10.5=$20442.50 You got the correct answer, but didn't type the correct equation. Which

    asked by Stephanie
  11. Math/Calculus

    Integrate: (2x^2+5)/((x^2+1)(x^2+4)) I came up with: (tan^-1)(x)-(1/2)((tan^-1)(2/x)) but it keeps coming back the wrong answer even though I integrated correctly. Is there a way to simplify this answer, and if so, how? Your answer is correct, but I think

    asked by COFFEE
  12. Math/Calculus #2

    Integrate: 1/(x-sqrt(x+2) dx I came up with: (2/3)(2*ln((sqrt(x+2))-2)+ln((sqrt(x+2))-1)) but it keeps coming back the wrong answer even though I integrated correctly. Is there a way to simplify this answer, and if so, how? I found: Ln[x-sqrt(x+2)] +

    asked by COFFEE
  13. Philosophy

    can someone explain what this teacher wants me to do, do I put and x in the box or write something this all new to me. thank you HELP!!!! Socrates, Plato, and Aristotle Matrix Fill in the matrix below, denoting each philosopher’s view concerning the

    asked by kathy
  14. Algebra

    1. (2x-6)/(21) divided by (5x-15)/(12) 2. Solve (x)/(x-9)-4=(9)/(x-9)..I got -6, is that correct? 3. Add. Express your answer in simplest form...(4)/(s)+(6)/(s^2).. 4. Add. Express your answer in simplest form...(x^2)/(x+4)+(8x+16)/(x+4) Lets check you

    asked by Helpless in Math
  15. math

    What is 1.9x10^27?

    asked by aj
  16. Physical Science

    I am working on PS and I have a couple of questions. 1) If 24 amperes of current flows through an appliance connected to a 120-volt circuit what is the resistance of the appliance. A).22 ohms b)5 ohms c)50 ohms d)2880 ohms I am not sure how to go about

    asked by Abby
  17. Algebra

    Could someone correct my answers and help with the other problems? 1. Are the following lines parallel, perpendicular, or neither? L1 with equation x – 5y = 10, L2 with equation 5x + y = 5. Answer: Neither (I'm not to sure but i think this is the right

    asked by Timm
  18. Math

    the problem is to graph the equation below. 3x - y < 2 and x + y > 2 my solution is y = 3x - 2, y = -1x + 2 I,m lost at where my lines ar drawn. In y = 3x - 2 (y line is 3) and y = -1x +2 (y line is -1) or am I totaly lost. After continued effort I beleive

    asked by Sissy
  19. social studies

    can you please tell me about brihadeeshwara temple and the ways to protect it? I can't find much in terms of protecting it. I assume it's protected under some law citing it as a historic masterpiece, but I did not see anything in what I was searching

    asked by anjana
  20. chem

    hi, Can anyone plz advise me if this is the correct ballanced equation for CH4+NH3+O2 - HCN+H2O Answer: CH3+NH2+O1 - H3N+H2O1 Is this correct? Thanks ;) No, that is not correct. Hint: Put a six on the HCN Thanks!! At the end of it? I don't understand how

    asked by bertie
  21. calculus

    integration by parts: 1. e^(sqrt(3x+9)) 2. sin(lr) are the answers: 1. 2e^(sqrt(3x+9))(sqrt(3x+9)-1) + C 2. -r cos(lnr) + sin(lr) + C

    asked by cory
  22. Geometry

    How do I find the mesurements of a isosceles triangle? I have the sides set as E=72 degrees, and the legs that come down are 15, and i have to find D and F..I have no clue how to do this. Or any idea of a formula to help with this. The two base angles are

    asked by Fonda
  23. Math

    Gasoline accounts for 85% of the motor fuel consumed in the United States every day. If 8,882 thousand barrels (bbl) of motor fuel is consumed each day, how much gasoline is consumed each day in the United States? Round to the nearest barrel. Would his be

    asked by Lily
  24. Math

    In any angle ABC prove that the perimeter = a/Sin A(Sin A + Sin B + Sin C) Start with perimeter = a+b+c but b= aSinB/sinA and c= aSinC/SinA and if you don't remember, a=a=a*SinA/ SinA

    asked by Anonymous
  25. Algebra

    the problem is to graph 3x - y < 2 x + y > 2 my solution is y = 3x - 2, y = -1x + 2 I,m lost at where my lines ar drawn. In y = 3x - 2 (y line is 3) and y = -1x +2 (y line is -1) or am I totaly lost. After continued effort I beleive 1st equation m = 3 and

    asked by Sissy
  26. Algebra

    Which one is considerd a perfect square a) x^2-14x+9 or b) x^2+6x-9 Neither, if you typed them correctly.

    asked by Tony
  27. math

    The United States emitted 19.5 million t of nitrogen oxides (NO) into the atmosphere in 1987. One metric ton (1 t) equals 1,000 kg. How many kilograms of NO were emitted to the atmosphere in the United States during 1987? Assuming the 19.5 tons were metric

    asked by Michael
  28. Algebra

    Evaluate the given function for the value specified. 2. f(x) = x squared - 7x + 10; find (a) f(0), (b) f(5), and (c) f(-2). a) f(0)=> b) f(5)=> c) f(-2)=> I didn't see your work, so it's hard to critique it. Take the 0, 5, and -2 and plug it in for "x" in

    asked by Linda
  29. math

    Mark uses 1 pt 9 fl oz and then 2 pt 10 fl oz from a container of film developer that holds 3 qt. How much of the developer remains? How would I set this problem up? Find out how many pints are in 3 qts. Find out how many oz are in a pint. Then you can

    asked by Rhonda
  30. History

    Hey I need help finding why "Capitalism has produced great wealth and inequalities in today's world." http://www.google.com/search?q=capitalism&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA There are several good articles

    asked by TnT
  31. geometry

    hi, can anyone plz help? im asked to work out the gradient of a straight line, which i understand fine. Its which units to use that confuse me. if distance is on the vertical axis and time/days is along the horizontal axis, what will the gradient be

    asked by bertie
  32. Algebra

    1.Solve (x)/(x+10)+(x-3)/(x+2)=7/5..I got that there is no solution, is that correct? 2. Solve (x)/(x-5)+1=(5)/(x-5)..I got that there is no solution for this one too, is that correct? 3. Express your result in simplest form, (4)/(xy)+(6)/(xy)..I got

    asked by Helpless in Math
  33. Algebra

    Could someone correct my answers and help with the other problems? 1. Are the following lines parallel, perpendicular, or neither? L1 with equation x – 5y = 10, L2 with equation 5x + y = 5. Answer: Neither (I'm not to sure but i think this is the right

    asked by Tim
  34. Microeconomics

    On one society A the price of an apple is $3 and the price of an orange is $7, while on socity B the apple and orange are the same price, $4. society A people consume 10 apples and 8 oranges while societyB people consume 8 apples and 12 oranges. Which

    asked by Aloha
  35. Management accounting

    Suppose one chairlift costs $2 million and the slopes along with the lift have to be install for $1.3 million, this lift allows 300 skiers on the slopes, for 40 days out of a year. Running the lift will cost $500 a day for 200 days that the ski resort will

    asked by please help !!!
  36. Math

    Yi Chen made a $6,400 investment at the beginning of a year. By the end of the year, the value of the investment had decreased by 8.2%. What was it's value at the end of the year? How would I do this? I am so very lost! Value= 6400(1-.082) would it not be

    asked by Heather
  37. physical science

    what is required for work a force moving something, and movement of that something in the direction of work.

    asked by megan
  38. science

    does jupiter have a clockwise or counterr-clockwise rotation? Both. It depends on the direction you are looking. For instance, looking at the Earth, from the South of Earth, Earth has clockwise rotation. But looking at it from the North, is is

    asked by carol
  39. chemistry

    how can you prove that there are air molecules in an inflated football? why do mechanics tell you to check your car tires in the spring time? what conditions are necessary for ideal carbonation of a beverage?

    asked by sam
  40. ECO301

    Give an example of a shift in consumer and producer surplus. How did it affect the market efficiency? Any non-subsidized farm product is a good example. Consider the local orchardists who sell peaches. When the weather is perfect, there is an abundance of

    asked by tracey
  41. Algebra

    x^2+7x Which constant should be added to make this expression a perfect square 12¼

    asked by Tony
  42. Algebra

    I need help with proportions. Can someone explain to methis whole mn=pq thing or x/3=4/6 I don't understand how to di it. Please help! :) m is to n as p is to q. m/n=p/q you can solve for any of the four in terms of the others: m= np/q p=mq/n n=mq/p q=np/m

    asked by Avalon
  43. Algebra

    Find the equalibrium price D=-5p+40 s=-p^2+30p-8

    asked by Tony
  44. Algebra

    The base of a ladder is 14 feet away from the wall. The top of the ladder is 17 feet from the floor. Find the length of the ladder to the nearest thousandth. length^2=14^2 + 17^2

    asked by Audrey
  45. algebra

    write (27a^-3)^(-2/3) in simplest form. solve log(6x+11)=2 please and thanks I need to see your work on the first. On the second, take the antilog of each side what is the antilog? I'm not quite sure what to do for the first, but this is what I tried to

    asked by Lillian