Answer
$7$
Work Step by Step
Apply logarithmic property : $\log a^ b=b \log a$
$\log (10)^{7}=7 \log (10)$
Now, take logarithmic to the base $10$ and evaluate the result.
Therefore, our answer is: $\log (10)^{7}=7 \log_{10} (10)=7$
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