4. To store some important papers, you'll need a box. Graph the following equation: (10-2x) (19-2x)(x), which represents of the volume of a box made from a rectangular cardboard sheet 10 inches wide and 19 inches long from which a square is cut from each corner and the sides of the box are folded as shown. The value x represents the side length of the square cutout. Use the graph to find the maximum volume of the box. maximum volume = cubic inches