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Math Help - Project Help

  1. #1
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    Project Help

    I need help with a precalc project. area, volume, inequalities, etc. i can email scans to anyone who thinks they can help. thanks.

    heres the question
    you are putting in a 20ftx30ft rectangular pool. your pool must be surrounded by a concrete sidewalk of uniform width and 3in thick.

    write an expression in terms of x to represent the volume of concrete contained in the sidewalk. explain how you got your expression.
    Last edited by ClutchUSMC; February 28th 2008 at 03:44 PM.
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  2. #2
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    Hello, ClutchUSMC!

    You are putting in a 20ft x 30ft rectangular pool.
    Your pool will be surrounded by a concrete sidewalk of uniform width and 3 inches thick.

    Write an expression in terms of x for the volume of concrete in the sidewalk.
    Explain how you got your expression.
    I assume that x is the width of the sidewalk.
    Code:
          : x : - 30  - : x :
        - * - - - - - - - - * - -
        x |                 |   :
        - |   * - - - - *   |   :
        : |   |         |   |   :
       20 |   |20       |   | 20+2x
        : |   |    30   |   |   :
        - |   * - - - - *   |   :
        x |                 |   :
        - * - - - - - - - - * - -
          : - -  30+2x  - - :

    The total area is: . (30+2x)(20+2x) \:=\:600 + 100x + 4x^2 ft²

    The pool area is: .  30 \times 20 \:=\: 600 ft²

    The area of the sidewalk is: . (600 + 100x + 4x^2) - 600 \:=\:100x + 4x^2 ft²

    The thickness of the sidewalk is: . 3\text{ inches }=\:\frac{1}{4}\text{ ft}

    Therefore, the volume of the concrete is: . V \;=\;\frac{1}{4}(100x + 4x^2) \;=\;25x + x^2 ft³

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  3. #3
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    the quoted price for finishing the concrete is
    $.75 per square foot plus $.25 a linear foot measured along the outer perimeter. they have a minimum charge of $500

    write an expression for the number of square feet of concrete that will need to be finished. how much do you expect to pay for placing and finishing the concrete? why?
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  4. #4
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    bump...

    please help me? someone
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