Answer:
4, 6, 9, 12, 15, 18, 21, <u><em>24.</em></u>
Step-by-step explanation:
The 8th term is 24.
just +2 (add 2) every time.
It depends on which triangle it actually is
Please, find the solution atached in JPG format
I'm going to need more information before I can answer.