3 (Sections 5.1) (a) Estimate the area under the graph of f(x) = 4- from x = -1 to z = 2 using three approximating rectangles of width 1 and right end points. (b) Repeat part(a) using left endpoints. (c) Repeat part(a) using midpoints. (d) Which estimate is the most accurate? 4 (Section 5.1) (a) Let f(x) = 1 + x and A be the area under f(x) between x = 0 and 2 = 1. What is A? (b) Give a formula for Rn, the area of n right rectangles, and evaluate working. lim Rn. Show your 84x