Posted by Serena on Saturday, July 26, 2008 at 1:59am.
It looks like they want you to use the trapezoidal rule, which is explained here:
http://metric.ma.ic.ac.uk/integration/techniques/definite/numerical-methods/trapezoidal-rule/
Looks more primitive than trapezoids to me, rectangles.
In each interval, use the y value on the left of that block for the height in part a
In each interval use the y value on the right of that block for part c (you have already calculated most of them for part a because except for the first one on the left, the left in part a becomes the right in part c
Now part b is a pain because you have to calculate new values of y in the middle of each interval and for the area of that block use that height times the interval in x
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