Evaluate `log_10 10000`

Explanation

To evaluate \( \log_{10} 10000 \), we can follow these steps:

### Step 1: Rewrite 10000 as a power of 10
We know that \( 10000 = 10^4 \).

### Step 2: Apply the logarithmic identity
Using the logarithmic identity \( \log_b (a^n) = n \cdot \log_b a \), we can rewrite our expression:
\[
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