Answer
$3$
Work Step by Step
$\sqrt {25-16}$
$=\sqrt {9}$
$=3$ because $3^{2}=9$
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.