Answer
$-3$
Work Step by Step
Using the property $\log_b b^x=x$ then the expression $
\log 10^{-3}
$ is equal to
\begin{array}{l}
\log_{10} 10^{-3}
\\=
-3(\log_{10} 10)
\\=
-3(1)
\\=
-3
.\end{array}
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