Approximate the area of the region bounded by y equals x squared plus 4, the x-axis, x equals short dash 3, and x equals short dash 1 by finding the combined area of the rectangles (as shown in each figure) and averaging the results. a.) 4.25 space u n i t s squared b.) 4 space u n i t s squared c.) 17 space u n i t s squared d.) 26 space u n i t s squared