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 $.
Functions Modeling Change: A Preparation for Calculus, 5th Edition
by Connally, Eric; Hughes-Hallett, Deborah; Gleason, Andrew M.; Cheifetz, Phil C.
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 - Page 6: S3
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