Answer
A. -4
Work Step by Step
As shown on page 445, we know that $a^{\frac{m}{n}}=\sqrt[n] a^{m}=(\sqrt[n] a)^{m}$.
Therefore, $-16^{\frac{1}{2}}=-\sqrt[2] (16)^{1}=-\sqrt 16=-(4)=-4$.
We know that $\sqrt 16=4$, because $4^{2}=16$.
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.