Functions Modeling Change: A Preparation for Calculus, 5th Edition

Published by Wiley
ISBN 10: 1118583191
ISBN 13: 978-1-11858-319-7

Chapter 1 - Linear Functions and Change - Exercises and Problems for Section 1.1 - Skill Refresher: S3

Answer

$6 \pi r^2$.

Work Step by Step

$2 \pi r^2 + 2 \pi r \cdot 2 r = 2 \pi r^2 + 4 \pi r^2 = (2 + 4) \pi r^2 = 6 \pi r^2 $.
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