Sketch the points given. Use rectangles to estimate the distance traveled by the rocket over the first 120 seconds as directed.
(a) ... using 3 subintervals of equal width and the midpoint for sample points.
http://i48.tinypic.com/65ac1e.jpg

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I tried using the rieman sum midpoint but I keep getting it wrong!!!!

how are you supposed to divide 140 in to three sub intervals? got me.

It changed it to 120

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