3. Select values of twice-differentiable function f are shown in the table. 2 5 10 11 f(x) 4 6. a) Approximate f,f(x) dx using a right Riemann sum with 3 subintervals. b) Approximate “f(x) dx using a trapezoid sum with 3 subintervals. -15 15 c) If " f'(x) dx = 6, find S f'(x) dx.

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