Given the function, f(z) = ad 4 Szz, using 6 rectangles of equal width, find an approximation to the area between the curve and the z-axis over the interval [4,8] if the heights of the rectangles are found by evaluating the function at the left endpoints, right endpoints, and midpoints of each subinterval created by a partition of the interval given. Using left endpoints, the approximate area is |7' Using right endpoints, the approximate area is: |_| Using midpoints, the approximate area is: | |