(b) Repeat part (a) using left endpoints.

L3	=
L6	=

(c) Repeat part (a) using midpoints.

M3	=
M6	=

(a) Estimate the area under the graph of f(x) = 9 4x2 from x =-1 to x = 2 using three rectangles and right endpoints. R3 = 47 Then improve vour estimate by using six rectangles. R6 42.5 Sketch the curve and the approximating rectangles for R3. 25 25 20 20 1 0 25 25 20 20 10 10 Sketch the curve and the approximating rectangles for R6 25 25 20 20 10 10 0.5 0.5 0.5 0.5 25 25 20 20 10