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9 The rectangles in the graph below illustrate a right endpoint Riemann sum for f(x) = on the interval [2,6]. The value of this right endpoint Riemann sum is or , and this Riemann sum is [select an answer] the area of the region enclosed by y=f(x), the x-axis, and the vertical lines x = 2 and x = 6. y X 2 7 8 Right endpoint Riemann sum for y = on [2, 6] =

22 The rectangles in the graph below illustrate a left endpoint Riemann sum for f(x) = on the interval [2,6]. The value of this left endpoint Riemann sum is , and this Riemann sum is [select an answer] 9 V the area of the region enclosed by y = f(x), the x-axis, and the vertical lines x = 2 and x = 6. y 8 7 6 5 4 3 2 1 x 7 Left endpoint Riemann sum for y= = OI [2,6]