Answer:
https://www.wolframalpha.com/widgets/view.jsp?id=ecc4c3ee7c6b1f12d078f6541a983c2d
use that it will give you a step by step answer.
Answer:
its one
Step-by-step explanation:
octagon-4
hexagon-3
4-3=1
your welcome
Answer: 81
Explanation: Multiple three fourl