26. Volume A small shelter for delicate plants is to be con- structed of thin plastic material. It will have square ends and a rectangular top and back, with an open bottom and front, as shown in the figure. The total area of the four plastic sides is to be 1200 in?. (a) Express the volume V of the shelter as a function of the depth x. (b) Draw a graph of V. (c) What dimensions will maximize the volume of the shelter?

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