Answer
$r\cdot \log_a M$
Work Step by Step
By the properties of logarithms we know that $\log_a M^r=r\cdot \log_a M.$
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.