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3 A. Estimate Ifdx l 'l . a . Estimate the integral using 4 rectangles and left endpoints. b. Did you underestimate or overestimate the area? C e. a. b. C e. . Write out how the estimate was obtained. . Write how the estimate was obtained using sigma notation. Graph the area and the four rectangles. Estimate the integral using 4 rectangles and right endpoints. Did you underestimate or overestimate the area? . Write out how the estimate was obtained. . Write how the estimate was obtained using sigma notation. Graph the area and the four rectangles