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3-186.

Write a Riemann sum to estimate the area under the curve for using left endpoint rectangles given. Then calculate the areas for and rectangles. Which approximation 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 terms than with terms. What is the benefit of using  terms?