Answer
$$4 j.$$
Work Step by Step
We use the fact that $j=\sqrt{-1}$ and simplify as follows:
$$\sqrt{-16}=\sqrt{(-1)(16)}=\sqrt{-1} \sqrt{16}=4 j.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 11 - Test - Page 380: 13
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