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The rectangles in the graph below illustrate a right endpoint Riemann sum for f(x) = 5 - + 2x on the interval [3, 7]. The value of this right endpoint Riemann sum is , and this Riemann sum i v [select an answer] area of the region enclosed by y = f(x), the x-axis, and the vertical lines x = 3 and x = 7. an overestimate of equal to an underestimate of there is ambiguity Right endpoint Riemann sum for y = = + 2x on [3, 7]