A Rectangular Region with Area 3200 Square Feet Is to Be

A rectangular region with area 3200 square feet is to be enclosed within a fence. The two sides which run north-south will use fencing materials costing $1.00 per foot, while the other two sides require fencing materials which cost $2.00 per foot. Find the dimensions of the region which gives the smallest material cost.

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80 ft (north-south f...

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