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Math Help - MCAS question -please help

  1. #1
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    MCAS question -please help

    info given

    square kennel 10 ft by 10 ft
    the guy wants to increase the area of the square kennel by removing two sides of the square and adding fencing to make a new rectangular kennel

    A. write an expression in terms of x to represent the width, in feet, of the new rectangular kennel

    B. write an expression in terms of x to represent the length, in feet, of the new rectangular kennel

    C. Use the expressions you wrote in part (a) and part (b) to write an equation for A, the area, in square feet, of the new rectangular kennel

    D. Mario wants the new rectangular kennel to have an area of 300 square feet. if the value of A is 300 in the equation you wrote in part (c), what values of x will make the equation true? show or explain how you got each of your answers

    E. If the value of a is 300 in the equation you wrote in part (c), what should be the width and length, in feet, of Mario's new rectangular kennel. Show or explain how you got each of your answers

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  2. #2
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    Quote Originally Posted by xxbrokenwishesxx View Post
    info given

    square kennel 10 ft by 10 ft
    the guy wants to increase the area of the square kennel by removing two sides of the square and adding fencing to make a new rectangular kennel

    A. write an expression in terms of x to represent the width, in feet, of the new rectangular kennel

    B. write an expression in terms of x to represent the length, in feet, of the new rectangular kennel

    C. Use the expressions you wrote in part (a) and part (b) to write an equation for A, the area, in square feet, of the new rectangular kennel

    D. Mario wants the new rectangular kennel to have an area of 300 square feet. if the value of A is 300 in the equation you wrote in part (c), what values of x will make the equation true? show or explain how you got each of your answers

    E. If the value of a is 300 in the equation you wrote in part (c), what should be the width and length, in feet, of Mario's new rectangular kennel. Show or explain how you got each of your answers

    http://i13.photobucket.com/albums/a299/EmmaRox/life.png
    ++++++++++++++++++++++++++++++++++++++++++++++++++ ++++
    According to drawing, I get something like this:
    A. W = 10 +X
    B. L = 10+ (X+5) = X +15
    C. Area = W * L = ( 10 + X ) * ( X + 15)
    D. 300 = X^2+25X+150
    X = 5 , X=-30 (NO SENCE)
    So, Plug X =5 into A and B find W and L
    W=15, L=20
    W * L = 15 * 20 = 300.
    Last edited by 2976math; November 11th 2008 at 04:15 AM.
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