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Mathematics - Other

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A farmer has $2250 to spend on fencing material to enclose a pasture using an existing river as one side. If the fencing material costs $25 per yard, what is the maximum area he can enclose in square feet?

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Let the length of the pasture (parallel to the river) be x and its width be y.

Then the fence length required = y + x + y = x + ...

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