Approximate the area of the region bounded by y equals short dash 1 fourth x squared plus 9, the x-axis, x equals short dash 4, and x equals 0 by finding the combined area of the rectangles (as shown in each figure) and averaging the results. 22 space u n i t s squared 9 space u n i t s squared 12.5 space u n i t s squared 30 space u n i t s squared