The rectangles in the graph below illustrate a left endpoint Riemann sum forf (x)=(15/x)on the interval[2,6].

The value of this left endpoint Riemann sum is, and this Riemann sum isan overestimate ofequal toan underestimate ofthere is ambiguitythe area of the region enclosed byy=f(x) , the x-axis, and the vertical lines x = 2 and x = 6.

The rectangles in the graph below illustrate a left endpoint Riemann sum for f(a:) = (15/m) on the interval [2, 6]. The value of this left end oint Riemann sum is is \\ an overestimate of a the area of the region enclosed by y = f (x), the x-axis, and the vertical lines x = 2 and x = 6. Left endpoint Riemann sum for y = (15/ an) on [2, 6