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2-117.

If , use sigma notation to write Riemann sums to approximate A(h, 10 ≤ x ≤ 15) with 10, 20, and 100 left endpoint rectangles of equal width. Then, use your calculator to find these approximations. What happens as the number of rectangles increases? Homework Help ✎

10 left-endpoint rectangles:

20 left-endpoint rectangles:

100 left-endpoint rectangles: