This is NOT an arithmetic sequence because there is no common difference. It is a geometric sequence because there is a common ratio. Meaning that each term is a constant ratio or multiple of the previous term. The recursive rule for this geometric sequence is:
a(n)=3*a(n-1), a(1)=3
It's a hexagon.
The formula of the sum of internal angles in the polygon:

Therefore

Answer:
1st 3rd and 4th
Step-by-step explanation:
I just did that
30 is the answer. You do 10X 3 which is 30- 2 which is 28 and 28 to the nearest 10th is 30