posted by Cindy .
Do the following. (Round your answers to four decimal places.)
(a) Estimate the area under the graph of f(x) = 8 + 2x2 from x = -1 to x = 2 using three rectangles and right end-points.
R3 = 1
Improve your estimate by using six rectangles.
R6 = 2
(b) Repeat part (a) using left endpoints.
L3 = 3
L6 = 4
(c) Repeat part (a) using midpoints.
M3 = 5
M6 = 6