b) The rectangles in the graph below illustrate a right endpoint + Riemann sum for f(x) = The value of this Riemann sum is 8 * 2 11 on the interval [4, 8]. and this Riemann sum is an overestimate of * the area of the region enclosed by y = f(x), the x-axis, and the vertical lines x = 4 and x = 8. y 8 6 5 3 2 X 1 2 3 5 6 7 8 Right endpoint Riemann sum for y = x 11 on [4, 8]