Answer
86.6
70.6
79.2
Work Step by Step
Divide the interval into subintervals:
$(12-0)/2=2=x$
Use Left Endpoints to find the area
evaluate
$2[9+8.8+8.2+7.3+5.9+4.1+1]=79.2$
Do this using the Right-end points and left-end points
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