Free homework help here

Discussion in 'Archives' started by MatthewGor123, Oct 25, 2008.

Free homework help here
  1. Unread #121 - Nov 12, 2008 at 7:31 PM
  2. Water Drips
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    I need help with comparing and contrasting, 10 things i hate about you, to William Shakespeare taming of the shrew

    Patrick/Petruccio

    Bianca

    Cameron/Hortensio
     
  3. Unread #122 - Nov 13, 2008 at 11:09 AM
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    10 Things the show on TV?
    Poetic prose vs. cliched writings?
     
  5. Unread #123 - Nov 13, 2008 at 8:04 PM
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    ..JUST WANTED TO POST THIS..

    after matt's help I got a 93 on my college algebra II

    tyvm =] ill prob take a picture with my phone and post it heh
     
  7. Unread #124 - Nov 13, 2008 at 8:30 PM
  8. MatthewGor123
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    xDxD :) Glad we could help! :cool: If you ever need any more help, don't hesitate to ask. It's what we're here to do ^_^
     
  9. Unread #125 - Nov 14, 2008 at 1:42 AM
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    I need some help quick.

    Basically I have found a lot of stuff on how to graph a polynomial equation but,
    how do I find the formula of polynomial on a graph?

    Basically I have a graph of a polynomial and I have to find the formula. How would I do this?
     
  11. Unread #126 - Nov 14, 2008 at 1:47 AM
  12. MatthewGor123
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    Hmm, if you could edit this post and post a picture of the graph itself, and how many degrees the polynomial must have, I think I could help you. If not, somebody else definitely could - but a bit more information would be nice to have.
     
  13. Unread #127 - Nov 14, 2008 at 1:58 AM
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    Sorry its blury. The numbers on the x axis are -1, 3, 4 and the number on the y axis is 3.

    [​IMG]
     
  15. Unread #128 - Nov 14, 2008 at 2:32 AM
  16. ivirz
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    To find the solution to this problem, we must first use what we know about graphs of functions. When you try to solve for the roots of a function (the points on x where y is equal to zero, also called the x intercepts) you first try to break the formula down in pieces. For example, if you wanted to know the roots of f(x) = x^2+4x+3, you would factor it to f(x) = (x+1)(x+3), and you would know the roots/x intercepts would be -1 and -3.

    In this question, the roots are already given, at -1, 3, and 4. So we just throw them into an equation really fast:

    f(x)=(x+1)(x-3)(x-4)

    and then we can expand it:

    f(x)=(x^2-2x-3)(x-4)

    f(x)=x^3 - 6x^2 + 5x + 12

    Great! we have our formula. But wait, when we graph it, its gets all wonky, like its stretched out, and doesnt have the right y intercept. Well, we have to modify the formula now, with a vertical stretch. This just means we will multiply the entire formula by a certain number.

    So, we know that we want the y intercept to be at 3. (Recall, the y intercept occurs when x=0) Right now, when we plug the x=0 into our equation, we end up with:

    f(x)=(0)^3 - 6(0)^2 + 5(0) + 12

    f(x)=12

    Well, thats not right. We want it to be 3. So this is where we do our vertical stretch. We want 12 to be three, so we will have to multiply it by 0.25. !BUT! we need to make sure we do this to the entire equation.

    So, our answer looks like:

    f(x)=0.25[x^3 - 6x^2 + 5x + 12]

    And we can expand it:

    f(x)=0.25x^3 - 1.5x^2 + 1.25x + 3

    And thats your answer. I dont know how well I explained, didnt use much mathimatical jargon. Hope it helps!
     
  17. Unread #129 - Nov 14, 2008 at 8:46 PM
  18. MatthewGor123
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    You got on it before I got a chance to look at the thread ^_^. +1.

    If you need any more help with this explanation, feel free to PM me, but he definitely did a pretty great job.
     
  19. Unread #130 - Nov 15, 2008 at 3:55 AM
  20. ivirz
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    No problem. Just trying to help.
     
  21. Unread #131 - Nov 16, 2008 at 4:12 PM
  22. Ganzta-Freak
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    Simple math problem.
    We didn't really learn it yet, so if I could learn how to do this from one of you guys, that would be AWESOME. :)

    3y + 2 - y + 1 = _________

    3x - (2y + 2x) = _________
     
  23. Unread #132 - Nov 16, 2008 at 4:42 PM
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    You haven't explained what you want solving, so that doesn't make much sense to me.
     
  25. Unread #133 - Nov 16, 2008 at 4:48 PM
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    First one:

    Compress:

    2y + 3 = ____
    3 = 2y
    y = 2/3

    Second:

    3x - 2y - 2x = ______

    Compress

    x - 2y = _____
    -2y = x
    y = -x/2


    If that's what you were looking for.
    -I think you were solving for Y.
     
  27. Unread #134 - Nov 17, 2008 at 1:24 AM
  28. ET Phone Home
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    I'm not sure what he was looking for either, but if "____" was supposed to be equal to zero, I think you got it right...

    but i think you might have messed up a teensy bit unbanned

    edit:

    haha, noticed this on page 5
    Sorry, but you were all wrong:
    1 + 3 - 2 + 7 x 36 - 10 + 102 x 6
    1 + 3 - 2 + (252) - 10 + (612)
    4 - 2 + 252 - 10 + 612
    2 + 252 - 10 + 612
    254 - 10 + 612
    244 + 612
    856
    lolowned
     
  29. Unread #135 - Nov 17, 2008 at 7:20 AM
  30. MatthewGor123
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    No, he got it all right...A for effort, though.



    Congrats, you got a C-level Arithmetic problem right. Good thing the person who posted this wasn't spamming or anything.
     
  31. Unread #136 - Nov 17, 2008 at 2:23 PM
  32. alexderby
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    Hi This isnt a math's question but im 13 in year 8 (english second school)
    Top Set for maths does any1 know any usee full websites cuz i been slakin off a lil and i wnna catch up faaast.
    If you do cud u pm me the website also ty vm
     
  33. Unread #137 - Nov 17, 2008 at 2:49 PM
  34. Ganzta-Freak
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    It's not finding the Y.
    It's like this:

    Reduce:

    3y + 2 - y + 1 =

    3x - (2y + 2x) =


    Got until tomorrow with this one. Oshyt. :)

    Also, if anybody could help me on this one:

    For 100 Canadian Dollars you get 521 Danish Kroner.

    - With 2605 Danish Kroner you get
    ______ Canadian Dollars.

    - Thanks guys. Need help on these as fast as possible.
     
  35. Unread #138 - Nov 17, 2008 at 2:55 PM
  36. The Fat Controller
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    3y + 2 - y + 1 =??????

    3x - (2y + 2x) =??????

    You can't have an equation which has an "=" sign and nothing on the right hand side. It has to be either 0 or something else.

    Ratio of Canadian Dollars to Danish Kroner is 100:521.
    Divide that by 100, you get the same ratio --> 1:5.21
    Divide both sides by 5.21 gives you --> 1/5.21:1
    This tells us you get 1/5.21 Canadian Dollars for 1 Danish Kroner.
    So with 2605 Danish Kroner you get (1/5.21)*2605 Canadian Dollars.

    2605*(1/5.21) = 500 Canadian Dollars exactly.
     
  37. Unread #139 - Nov 17, 2008 at 3:18 PM
  38. Ganzta-Freak
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    Thanks, got the canadian dollars part.
    Why didn't I think of that from the start? :p

    - I think I'll have to guess on the other ones, since the only information I get is:

    Reduce:

    3y + 2 - y + 1 = 3y+3 ?

    3x - (2y + 2x) = No clue.
     
  39. Unread #140 - Nov 17, 2008 at 5:09 PM
  40. MatthewGor123
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    3y + 2 - y + 1 = (3y - y) + (2 + 1) = 2y + 3

    3x - (2y + 2x) = 3x - 2y - 2x = (3x - 2x) - 2y = x - 2y

    Remember, in algebra you can only add parts that are "like terms" -- for example;
    if you had
    3(x^2) + 2x + 3 - 2(x^2) - 5, you would add all of the x^2 components, then all the x components, than all the x^0 (1) components. So, you would get 5(x^2), 2x, and -2. So, your final outcome would be 5x^2 + 2x - 2. If you have any further questions, don't hesitate to ask.

    Sorry, I don't think you made your question too clear at first.
     
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