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3-186.

Write a Riemann sum to estimate A(f, 5 < x < 13) for using n left endpoint (or other) rectangles. Then calculate the area for n = 8, 20, and 50 rectangles. Which is most accurate and why? Homework Help ✎

Refer to hints in problem 3-177 for further guidance about computing a left-endpoint Riemann sum.

Without a calculator, it is more time consuming to compute a sum with 50 terms than with 8 terms. What is the benefit of using 50 terms?