Answer:
-1.
Step-by-step explanation:
1) according to the DeMoivre's theorem:

2) if cos(π)=-1 and sin(π)=0, then cosπ+i*sin(π)=-1.
The Answer would be B 30 because the triangles are equal to each other so you divide the 60 by 2
Answer:
Volume=2616.67
Step-by-step explanation:
V=1/3pi r squared height
V=1/3(3.14)(10)squ.(25)
V=1/3(3.14)(100)(25)
V=2616.66667
V=2616.67