Answer:
1
Step-by-step explanation:
I haven't done these in a few years but I was thinking that if you lay it out there are 3 sides being un 3D'd, plus the base. Making it 4 sides total.
None of the other options have 4 sides, or are all triangles, making 1 your answer.
Hope this helps :)
Answer:
Open
Step-by-step explanation:
Closed = 
Open = > or <
Answer:
31
Step-by-step explanation:
0.9 would be the best guess i belive
Answer: sqrt (-121) is 11i
Step-by-step explanation: