Question: Problem 7.10. A rectangular plot of land is to be fenced in using two types of fencing. Two opposite sides will use heavy-duty fencing selling

Problem 7.10. A rectangular plot of land is to be fenced in using two types of fencing. Two opposite sides will use heavy-duty fencing selling for $3 a foot. The two remaining sides will use standard fencing selling for $2 a foot. What are the dimensions of the rectangular plot of greatest area that can be fenced in at a cost of $6000?

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