Barbara "Barb" Wire needs to fence off a rectangular enclosure of 7200 feet for her horses. Two opposite sides will need standard wire fencing costing $4 per foot and the remaining two sides will use heavy duty fencing costing $8 per foot. Find the dimensions of the rectangle of least cost and the cost of the resulting fence.
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Barbara "Barb" Wire needs to fence off a rectangular enclosure of 7200 feet for her horses. Two opposite sides will need standard wire fencing costing $4 per foot and the remaining two sides will use heavy duty fencing costing $8 per foot. Find the dimensions of the rectangle of least cost and the cost of the resulting fence.
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