Answer
7
Work Step by Step
We know that the logarithmic function of base 10, or the common logarithmic function, can be written as $f(x)=log_{10}x$ or as $f(x)=log x$.
Therefore, $log 10^{7}=log_{10}10^{7}=7$, because $(10)^{7}=10^{7}$.
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