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A farmer has to put in a fence in there rectangular field. If we look at...

A farmer has to put in a fence in there rectangular field. If we look at the field from above, the cost of the west and east sides are $20/ft, the cost of the south side is $4/ft and the cost of the north side is $8/ft. If we have $900, use optimization to determine the dimensions of the field that will maximize the enclosed area
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