Step-by-step explanation:
distance between (12.-7) and (-3, -7)

=12+3
=15 units
A complex number has a real and an imaginary part
is a complex number
A complex number is represented as:

Where:
<em />
<em> real</em>
<em />
<em> imaginary</em>
<em />
By comparing the options to
;
and
are not complex numbers
This is so because they do not have imaginary parts
However,
is a complex number
Because; 9i is imaginary
Read more about complex numbers at:
brainly.com/question/19007885
Answer:
That's great for Brad, wait are you talking about the Brad from clash royale? if so im impressed
Step-by-step explanation: