2 Consider f(a':) : % l 2:1: on the interval [4, 8]. (a) (i) Estimate the area under the graph of at) using 8 approximating rectangles and left endpoints (as illustrated in the graph below). Area % (ii) This Riemann sum is an ? v . (b) (i) Estimate the area under the graph of f(a:) using 8 approximating rectangles and right endpoints (as illustrated in the graph below). Area % (ii) This Riemann sum is an ? v . (Click on each graph to open in a new window.) y LC 4 4 x 9 1 X 9 (a) Left endpoint Riemann sum for y = - + 2x on [4, 8] (b) Right endpoint Riemann sum for y = _ 6 + 2x on [4, 8]