The answer is 9 because you solve it from left to right and 3x5 equals 15, 15 subtracted by 6 equals 9
Step-by-step explanation:
Each term is 2 more than the previous term, and the first term is 12, so the recursive formula is:

This is an arithmetic sequence, so the explicit formula is:

The next three terms are 20, 22, 24.
Subduction should be added to divergent boundaries