Answer
$x = 1 \times 10^{-4}$
Work Step by Step
$\log x = - 4$
$\log_{10} x = -4$
$x = 10^{-4}$
$x = 1 \times 10^{-4}$
Check:
$\log x \overset{?}{=} - 4$
$\log_{10} 10^{-4} \overset{?}{=} - 4$
$10^{-4} = 10^{-4}$
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