A farmer wants to fence in a rectangular field that encloses 3600 square feet. One side of the field is along a river and does not require fencing. The fencing costs $3.50 per foot. Express the total cost C(x) of the fencing (in dollars) as a function of x.
Please explain. Thank you!

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Can you answer the following? Write a formula for the length of the fence (using x & y).

Would that be 3600=x+x+y? The last one C(x)=3.50(x+3600/x) but I am not sure.

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