(a) Estimate the area under the graph of $f(x) = 25 - x^2$ from $x = 0$ to $x = 5$ using five approximating rectangles and right endpoints.

$R_5 =$

(b) Repeat part (a) using left endpoints.

$L_5 =$

(c) By looking at a sketch of the graph and the rectangles, determine for each estimate whether it overestimates, underestimates, or is the exact area.

? Underestimate Overestimate Exact  1. $R_5$

? Underestimate Overestimate Exact  2. $L_5$