Question: Please explain step by step using calculus methods (the derivative to find max area) 1. A rectangular piece of land is to be fenced in

Please explain step by step using calculus methods (the derivative to find max area)

1. A rectangular piece of land is to be fenced in using two kinds of fencing. Two opposite sides will be fenced using standard fencing that costs $6/m, while the other two sides will require heavy-duty fencing that costs $9/m. What are the dimensions of the rectangular lot of greatest area that can be fenced in for a cost of $9000

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