Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 9 - Section 9.3 - Exponential Functions - Exercise Set: 44


There were around $463.2$ million cell phone users in the UNited Stated in 2014.

Work Step by Step

We have to assume that the given equation would still model the number of cell phone users after 2010 2014 is 12 years after 2002 so $x=12$. Substitute 12 to $x$ in the equation to have: $\\y=136.76(1.107)^x \\y=136.76(1.107)^{12} \\y=463.159464 \\y\approx 463.2$
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