Question

Use the properties of complex numbers to subtract −5i−16i .(1 point)
Responses

−21i
negative 21 i

11i
11 i

21i
21 i

−21

Answer 1

To subtract the complex numbers \(-5i\) and \(-16i\), you simply combine the imaginary parts:

\[
-5i - 16i = (-5 - 16)i = -21i
\]

So the answer is:

\(-21i\) (or negative 21 i).