Question: An open box is to be made from a square piece of cardboard whose sides are 23 inches long, by cutting squares of equal size

An open box is to be made from a square piece of cardboard whose sides are 23 inches long, by cutting squares of equal size from the corners and bending up the sides. Determine the size of the square that is to be cut out so that the volume may be a maximum. A square with a side of length D inches should be cut away from each corner to obtain the maximum volume. (Round to two decimal places as needed.)
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