Question: Use a Riemann sum with n = 4 and left endpoints to estimate the area under the graph of f (x) = 4 - x

Use a Riemann sum with n = 4 and left endpoints to estimate the area under the graph of f (x) = 4 - x on the interval 1 ≤ x ≤ 4. Then repeat with n = 4 and midpoints. Compare the answers with the exact answer, 4.5, which can be computed from the formula for the area of a triangle.

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