Answer
$f^{-1}(P)$ gives the time in years at which the population is $P$ million.
Work Step by Step
If $P=f(t)$, then $t=f^{-1}(P)$, so $f^{-1}(P)$ gives the time in years at which the population is $P$ million.
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 2 - Functions - Review Exercises and Problems for Chapter Two - Page 110: 41
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