Answer
$\approx5~years$
Work Step by Step
$N=5.5·10^{0.23x}$
$78=5.5·10^{0.23x}$
$\frac{78}{5.5}=10^{0.23x}$
$\log10^{0.23x}=\log\frac{78}{5.5}$
$0.23x=\log\frac{78}{5.5}$
$x=\frac{\log\frac{78}{5.5}}{0.23}=5.008$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 5 - 5.4 - Exponential and Logarithmic Equations - 5.4 Exercises - Page 396: 83
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