(a) Find an approximation to the integral (x² - 4x) dx using a Riemann sum with right endpoints and n = 8. (Round your answer to four decimal places.) (b) Draw a diagram like the image displayed here to illustrate the approximation in part (a). y y 5 y y 5 5 X -4 (c) Use the theorem to evaluate (x2 - 4x) dx. 3

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