Precalculus (6th Edition)

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


$I10^{-\frac {d}{10}}$

Work Step by Step

$d=10\log \dfrac {I}{I_{0}}\Rightarrow \log \dfrac {I}{I_{0}}=\dfrac {d}{10}\Rightarrow \dfrac {I}{I_{0}}=10^{\frac {d}{10}}\Rightarrow I_{0}=I10^{-\frac {d}{10}}$
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