Minimizing total cost?

A landscape architect plans to enclose a 1500 square foot rectangular region in a botanical garden. She will use shrubs costing $25 per foot along three sides and fencing costing $10 per foot along the north side.



If x is the length of fencing used, write a formula for the total cost in terms of x only.



(b) Find the length of fence that will minimize the total cost.

x =

Minimizing total cost?
(a) 35x + 75000/x = total cost



(b) is hard to show on the computer without writing scripting language and yahoo will not allow that in answers.

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