decimal places What does the Riemann sum represent Illustrate with a diagram If f x x 4 0 x 3 evaluate the Riemann sum with n 6 taking the sample points to be midpoints What does the Riemann sum represent Illustrate with a diagram a Evaluate the Riemann sum for f x 1 x 1 x 2 7 A table of values of an increasing function f is shown the table to find lower and upper estimates for f x 30