Answer
$56$
Work Step by Step
If we approximate the area using the left endpoints, then: $A=(2-0)f(0)+(4-2)f(2)+(6-4)f(4)+(8-6)f(6)\\=2f(0)+2f(2)+2f(4)+2f(6)\\=2(10)+2(5)+2(7)+2(5)=56$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 14 - A Preview of Calculus: The Limit, Derivative, and Integral of a Function - 14.5 The Area Problem; The Integral - 14.5 Assess Your Understanding - Page 904: 7
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