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Homework Help: Tricky word problem

  1. Sep 27, 2009 #1
    Fencing around a rectangular parking lot costs twice as much along the side facing the street than the other three sides. The fencing along the back of the lot costs $10 per meter. Express the cost C of the fence as a function of the width w if the length of the street side of the parking lot is 20m longer than the width.

    Here is the best I could come up with..


    How does that look?
  2. jcsd
  3. Sep 27, 2009 #2
    2nd attempt..

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