b. x=y-3,x%32y. Axis y=4

find the maximum volume of a rectangular box that a post office will accept for delivery of the sum of its length and girth cannot exceed 108 inches

A landowner has 1200 ft of fencing material with which to enclose a rectangular space immediately next to a building wall. If the building wall does not require any fencing along that edge, what is the largest area that can be enclosed?   Maximum area:                   (sq. ft)Length parallel to building wall:          (ft)Length perpendicular to building wall:        (ft)