## Calculus with Applications (10th Edition)

$10^{-3}=0.001$
From the definition of logarithms, for $a>0$, $a\neq 1$, and $x > 0$, $y=\log_{a}x$ means $a^{y}=x$. --------- The logarithm with base $10$ is written as log (no base specified). $-3=\log_{10}(0.001)\ \$ means $\ \ 10^{-3}=0.001 .$