Area is length times width. In this case, if we use all 3300 feet of fence, the width (distance from the river to the fence opposite can be x, and the fence opposite the river will be 3300-2x (the total amount of fence, less the amount on the other two sides) so the area as a function of x to meet the specification of the problem will be:
A(x)=x(3300−2x)=(43560)20
It looks to me that you could turn it into a quadratic equation (ax^2+bx+c=0) and solve it....
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