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2. An open box will be made by cutting a square from each corner of a 6-ft by 6-ft piece of cardboard and then folding up the sides. Let x be the length of the side of the square. a). Set up the volume of the box as a function of x: V(x), find the domain. b). Find V'(x), and find the critical numbers. c). Find the x value that produces a box of maximum volume. d). What is the maximum volume