Answer
$0$
Work Step by Step
As in the figure below, the area will be the area of the two triangles as follows
$$
\int_{6}^{8} 7-x d x= \frac{1}{2}- \frac{1}{2}=0.
$$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 5 - The Integral - 5.2 The Definite Integral - Exercises - Page 244: 5
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