Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 7 Exponential and Logarithmic Functions - 7.5 Apply Properties of Logarithms - 7.5 Exercises - Quiz for Lessons 7.4-7.5 - Page 513: 20



Work Step by Step

$L(I)=10\log\frac{I}{I_0}$ where $I_0=10^{−12}$. Hence here $L(I)=10\log\frac{10^{-4}}{10^{−12}}=10\log{10^8}=0\cdot8=80$
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