Answer
5.234
Work Step by Step
Based on the change of base property for common logarithms, we know that $log_{b}M=\frac{log(M)}{log(b)}$.
Therefore, $log_{\pi}400=\frac{log(400)}{log(\pi)}=\frac{2.6021}{0.4971}\approx5.234$.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.