Find an approximation to the integral 4 (x2 − 5x) dx using a Riemann sum with right endpoints and n = 8. R8 = (b) If f is integrable on [a, b], then b f(x) dx a = lim n→∞ n f(xi) Δx i = 1 , where Δx = b − a n and xi = a + i Δx. Use

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