(1 point) Estimate the area under the graph of f(x) = x/Sx + 6 from x = 0 to x = 4 using four approximating rectangles and right endpoints. Area is approximately ::: Sketch the graph and the four rectangles, if you have not already done so. Is your estimate above an underestimate or an overestimate? ? Now estimate the area under the graph of f(x) = V5x + 6 from x = 0 to x = 4 using four approximating rectangles and left endpoints. Area is approximately Sketch the graph and the four rectangles, if you have not already done so. 4) Is your estimate above an underestimate or an overestimate