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  1. Apr 18th, 2005, 08:33 PM #1
    Dillinger4
    Dillinger4 is offline

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    Resolved Calculate surface area?

    Am i doing this right?

    The base of a closed rectangular box has a length equal to 3 times it's width, which is w inches; it's height is 6 inches less than it's width. Express the surface area ,S of the box as a function of w.

    I had no clue how to calculate the surface area of a rectangle so i looked it up. I thought is was equal to volume v = lwh. Seems it's sa = 2(lw) + 2(lh) + 2(hw). So expressing the surface area S as a function of w should yield the following. sa(w) = 2(3w(w)) + 2(3w(w-6)) + 2(w-6(w)) which should boil down to S(w) = 14w2 - 48w. Looks right? Thanks.
    Last edited by Dilenger4; Apr 21st, 2005 at 09:26 PM. Reason: Resolved
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