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A farmer was told by the municipality to enclose a field by a river to keep...

A farmer was told by the municipality to enclose a field by a river to keep his animals out of the water. He decides to enclose a rectangular field as show below. The fence on the river side cost $30 per foot all other side cost $6 dollars per foot If he must enclose 145200 square feet, what values of x and y will minimize the cost?

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