Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 5 - Exponential and Logarithmic Functions - 5.4 Logarithmic Functions - 5.4 Assess Your Understanding: 133

Answer

$8.1$ magnitude

Work Step by Step

With $M(x)=\log\frac{x}{x_0}$, $x=125,892$, and $x_0=10^{-3}$, then plugging these values in gives: $M(10^{-7})=log\frac{125,892}{10^{-3}}=8.1$
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