Help me with these questions:

A candy box is made from a piece of cardboard that measures 39 by 21 inches. Squares of equal size will be cut out of each corner. The sides will then be folded up to form a rectangular box. What size square should be cut from each corner to obtain maximum volume?Two towns lie on the south side of a river. A pumping station is to be located to serve the two towns. A pipeline will be constructed from the pumping station to each of the towns along the line connecting the town and the pumping station. Thus, to minimize the amount of pipeline that must be constructed, the pumping station P is located |mi from C and Locate the pumping station to minimize the amount of pipeline that must be constructed. mi from D. 12 mi (Round to the nearest thousandth.) RIVER D 4 mi 8 mi B (Not drawn to scale)Find the absolute maximum and minimum values of the function on the given interval. f(x) = - X 2 +9, -35x52Find the absolute maximum and minimum values of the function on the given interval. f(x ) = X - + Inx, 0.6sxs2