Answer
$I=398,107$
Work Step by Step
$R=\log\frac{I}{I_0}$
$5.6=\log\frac{I}{1}=\log I$
$10^{5.6}=10^{\log I}$
$398,107=I$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 5 - 5.5 - Exponential and Logarithmic Models - 5.5 Exercises - Page 408: 45b
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