Estimate the Area Under the Graph Of $f ( x ) = 2 ^ { - x }$

Estimate the area under the graph of $f ( x ) = 2 ^ { - x }$ from $x = 0$ to $x = 4$ using
(a) four approximating rectangles and right endpoints.
(b) four approximating rectangles and left endpoints.
(c) eight approximating rectangles and right endpoints.

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a) The rectangles have width ...

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