A rectangle is bounded by the x- and y-axes and the graph of y = (6 X)/2 (see figure). What length (X) and width (y) should the rectangle have so that its area is a maximum? A rectangular package to be sent by a postal service can have a maximum combined length and girth (perimeter of a cross section) of 108 inches (see figure). Find the dimensions of the package of maximum volume that can be sent. (Assume the cross section is square.) Use differentials to approximate the value of the expression. Compare your answer with that of a calculator. (Round your answers to four decimal places.) 24.4 using differentials: using a calculator