Answer:
B. 
Step-by-step explanation:
DeMoivre's theorem:
If the complex number
then for natural number n

In your case,
and you have to evaluate 
By DeMoivre's theorem,

Answer:
c because no x value is repeated
4x°=75-x° this might be wrong but I’m sure
the solid line passes through (0,-3) and (0,9)
dotted line passes through (0,-3) and (0,-1)
see attached sketch
Answer:
I am not 100% sure, however 6x-8=10 add 8 to both sides then youĺl get 6x=18 you divide 6 on both sides, then x will = to 3. I hope this helps