(a) Find an approximation to the integral - 6x) 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 7 X -9 y y 7 7 X -9 -9 (c) Use the theorem to evaluate (x2 - бх) dx.

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