10. Approximate the net area under the curve of f(x) = 3x + 2x +1 over the interval [-1, 1] by using 4 subintervals (or
10. Approximate the net area under the curve of f(x) = 3x + 2x +1 over the interval [-1, 1] by using 4 subintervals (or rectangles) and evaluating the function at right-hand endpoints of the subintervals. a) Express R, in sigma notation. b) Compute R, and round your final answer to 2 decimal places. c) Find the EXACT answer for area under f(x)
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