be the 3. Let f(x) = 3x. a. Sketch the region R under the graph of f on the inter- 9. Repe val [0, 2], and find its exact area using geometry. on nonen be the b. Use a Riemann sum with four subintervals of equal length (n = 4) to approximate the area of R. Choose 10. Let f the representative points to be the left endpoints of the the in subintervals. be the c. Repeat part (b) with eight subintervals of equal length a. TV (n = 8). b. Fi d. Compare the approximations obtained in parts (b) and (c) with the exact area found in part (a). Do the c. Te approximations improve with larger n? d. Ca