A farmer plans to build a rectangular pen adjacent to a river out of the 2,400 ft of fencing he has in storage. This means he only needs to enclose three sides of the region (see picture below). y X A x (A) Find Area of the enclosed region as a function of the width of the region, x. (Submit your answer in factored form) A (x) = (B) What is the maximum area the farmer can enclose? Number ft² (C) What dimension should be used to create the pen of maximum area? = Number ft ft y = Number

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