Answer
$I10^{-\frac {d}{10}}$
Work Step by Step
$d=10\log \dfrac {I}{I_{0}}\Rightarrow \log \dfrac {I}{I_{0}}=\dfrac {d}{10}\Rightarrow \dfrac {I}{I_{0}}=10^{\frac {d}{10}}\Rightarrow I_{0}=I10^{-\frac {d}{10}}$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 4 - Inverse, Exponential, and Logarithmic Functions - Chapter 4 Test Prep - Review Exercises - Page 492: 67
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