College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 4 - Summary, Review, and Test - Review Exercises - Page 512: 81

Answer

This model projects in $2013$ when $1170.9$ million smartphones will be sold.

Work Step by Step

$S(t) = 21.4(1.56)^{t}$ $1170.9 = 21.4(1.56)^{t}$ $\frac{1170.9}{21.4} = (1.56)^{t}$ $t = \log_{1.56} \frac{1170.9}{21.4}$ by GDC / calculator $t = 9$ $2004 + 9 = 2013$
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