Question: Determine the appropriate function. Fencing around a rectangular storage depot area costs twice as much along the front as along the other three sides. The

Determine the appropriate function.

Fencing around a rectangular storage depot area costs twice as much along the front as along the other three sides. The back costs $10 per foot. Express the cost C of the fencing as a function of the width w if the length (along the front) is 20 ft longer than the width.

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