15 Suppose f(x) = ". (a) The rectangles in the graph on the left illustrate a left endpoint Riemann sum for f(x) on the interval 4 < x < 6. The value of this left endpoint Riemann sum is and it is an ? the area of the region enclosed by y = f(x), the x-axis, and the vertical lines æ = 4 and x = 6. (b) The rectangles in the graph on the right illustrate a right endpoint Riemann sum for f(x) on the interval 4 < a < 6. The value of this right endpoint Riemann sum is , and it is an ? the area of the region enclosed by y = f(x), the x-axis, and the vertical lines x = 4 and a = 6. ly 8 ly 8 7 7 6 5 4 4 3 3 4 5 6 7 8 5 6 7 8 Left endpoint Riemann sum Right endpoint Riemann sum

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