Answer
$3(y+5)$
Work Step by Step
The factors of $3y$ are $3$ and $y$ while the factors of $15$ are $3$ and $5$. Therefore, a $3$ can be factored out to get $3(y+5)$.
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.