This should explain it... you need to use a special right triangle! Let me know if you have any questions
Answer:
its A
Step-by-step explanation:
A)
5 – 12i = 3 + 2i
or, 3 – 2i
or, – 3 + 2i
or, – 3 – 2i
b)
3 + 4i is 2 + i
Answer:

Step-by-step explanation:
So first calculate what fraction of the circumference the arc is.

Now the circumference is 6, so one eighteenth of that is 
Answer:
k > -9
Step-by-step explanation:
Subtract 12 from both sides as we want to isolate k-
30 - 12 = 18
-2k < 18
Divide both sides by -2
18/-2 = -9
k > -9