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 - Page 559: 40b


The internet shopping revenues is expected to be around $\$624.5$ billion in 2015.

Work Step by Step

2015 is 12 years after 2003 so $t=12$. Substitute 12 to $t$ in the given equation to have: $\\y=39(1.26)^t \\y=39(1.26)^{12} \\y=624.4693803 \\y\approx 624.5$
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