(a) Estimate the area under the graph of RX) - 2v x from x - D to x -4 using four approximationg rectangles and right endpoints. (Round your answers to you sketch the graph and the rectangles. RD = 2VX Rx = 2Vx Rn=2VX Is your estimate an underestimate or an overestimate O overestimate underestimate (b) Repeat part (a) using left endpoints Sketch the graph and the rectangles. RX) -2VX 3 x = 2VX umale