Let f(x) = 4X. (a) Sketch the region R under the graph offon the interval [0, 2]. D 1 2 3 4 5 6 'If' gr Good work. Find its exact area using geometry. 8 or square units (b) Use a Riemann sum with four subintervals of equal length (n = 4) to approximate the area of R. Choose the representative points to be the le endpoints of the subintervals. 4.5 3: square units (c) Repeat part (b) with eight subintervals of equal length (n = 8). square units (d) Compare the approximations obtained in parts (b) and (c) with the exact area found in part (a). Do the approximations improve with larger n? a Yes No .7 Amazing work