Answer
$\log_{10}{(10,000)}=4 \text{ or } \log{(10,000)}=4$
Work Step by Step
Recall:
$$a^y=b \longleftrightarrow \log_a{b}=y$$
Use the definition above to obtain:
$$10^4=10,000 \longrightarrow \log_{10}{(10,000)}=4$$
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