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:
$M(10^{-7})=log\frac{125,892}{10^{-3}}=8.1$
Precalculus (10th Edition)
by Sullivan, Michael
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 - Page 298: 133
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