-. A strange man has four pigs and wants to keep them separated. But he is cheap, so he decides to build a large rectangular pen, and then adds to the inside three walls parallel to the width of the perimeter. (Now the four pigs are in the same pen, but separated by the three inside walls.) Each of the two lengthwise sides has a cost of 3 dollars per feet apiece, and cach of the five widthwise sides has a cost of 4 dollars per feet apiece. If the area of the whole pen is 100 feet squared, find the length of the sides that results in the pen of least cost. cu in. funetiona computo the antiderivative of f(r

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