Answer
$$\int^7_1\frac{3}{x}dx=3\ln7$$
Work Step by Step
$$A=\int^7_1\frac{3}{x}dx$$ $$A=3\ln|x|\Big]^7_1$$ $$A=3(\ln7-\ln1)$$ $$A=3(\ln7-0)=3\ln7$$
University Calculus: Early Transcendentals (3rd Edition)
by Hass, Joel R.; Weir, Maurice D.; Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0321999584
ISBN 13:
978-0-32199-958-0
Chapter 7 - Practice Exercises - Page 420: 9
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