# 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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