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Math Help - Basic algebra

  1. #1
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    Exclamation I Need Help Asap - My Homework Is Due By 12:00am!

    I am having major difficulties with my Alegebra, if anybody can help please hurry it's due soon! Here are my problems :

    1. A triangle has three sides 3x+7, 4x-9 and 5x-6. Find the expression that represents its perimeter.

    2. The quotient when 3 more than a number is divided by 3 less than that same number.

    3. 6x^2y^3+9x^2y^3
    3x^2y^2

    I am very confused and I have to be at work in a few hours so I need HELP ASAP!
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  2. #2
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    Quote Originally Posted by foofergutierrez
    I am having major difficulties with my Alegebra, if anybody can help please hurry it's due soon! Here are my problems :

    1. A triangle has three sides 3x+7, 4x-9 and 5x-6. Find the expression that represents its perimeter.
    (3x+7)+(4x-9)+(5x-6)=12x-8
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  3. #3
    Grand Panjandrum
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    Quote Originally Posted by foofergutierrez

    2. The quotient when 3 more than a number is divided by 3 less than that same number.
    Let x be the number, then we are told that:


    \frac{x+3}{x-3}

    RonL
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  4. #4
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    Red face Thanks

    I thought I was doing it wrong but it was right! Thanks for your help!
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  5. #5
    MHF Contributor Quick's Avatar
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    Quote Originally Posted by foofergutierrez
    I am having major difficulties with my Alegebra, if anybody can help please hurry it's due soon! Here are my problems :

    1. A triangle has three sides 3x+7, 4x-9 and 5x-6. Find the expression that represents its perimeter.
    the perimeter is all the sides added together so:

    side_1+side_2+side_3

    substitute: 3x+7+4x-9+5x-6

    group like terms: 3x+4x+5x+7-9-6

    add/subtract: 12x-8

    2. The quotient when 3 more than a number is divided by 3 less than that same number.
    3 more than a number, ( n+3) is divided by 3 less than a number, ( n-3)

    write it out: \frac{n+3}{n-3}

    and that number can't be simplified

    3. \frac{6y^3x^2+9y^3x^2}{3y^2x^2}
    add: \frac{(6+9)y^3x^2}{3y^2x^2}

    add: \frac{15y^3x^2}{3y^2x^2}

    seperate the fractions: \frac{15}{3}\times\frac{y^3}{y^2}\times\frac{x^2}{  x^2}

    write it out: \frac{3\times5}{3}\times\frac{yyy}{yy}\times\frac{  xx}{xx}

    divide: \frac{\not3\times5}{\not3}\times\frac{\not y\!\!\!\not yy}{\not y\!\!\!\not y}\times\frac{\not x\!\!\!\not x}{\not x\!\!\!\not x}

    write it out: 5\times y=5y

    voila

    [edit] I can't believe you guys, answering the questions quicker than me! (except for Cap'n's answer for #3, he's a bit late[/edit]
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  6. #6
    Grand Panjandrum
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    Quote Originally Posted by foofergutierrez
    :
    3. 6x^2y^3+9x^2y^3
    3x^2y^2
    Add the terms in the denominator to get:

    \frac{6x^2y^3+9x^2y^3}{3x^2y^2 }=\frac{15x^2y^3}{3x^2y^2 },

    then cancel so:

    \frac{6x^2y^3+9x^2y^3}{3x^2y^2 }=5y.

    RonL
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  7. #7
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    Wink You are my heros!

    Thank you all sooo much! I 'm sure that I will be on here again soon and I am sooo grateful for your brains. Thanks again and I'll be back soon!
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  8. #8
    Grand Panjandrum
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    Quote Originally Posted by foofergutierrez
    Thank you all sooo much! I 'm sure that I will be on here again soon and I am sooo grateful for your brains. Thanks again and I'll be back soon!
    Oh-Noooo... zombies

    RonL
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  9. #9
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by CaptainBlack
    Oh-Noooo... zombies

    RonL
    Oh good Lord! (Shakes his head in despair, wishing he had thought of it first.)

    -Dan
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  10. #10
    MHF Contributor Quick's Avatar
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    You know what I'm wondering? What kind of teacher has something due at midnight...
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  11. #11
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Quick
    You know what I'm wondering? What kind of teacher has something due at midnight...
    You know, I made that mistake once and showed up for a Ceramics lab 12 hours late...

    -Dan
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