Answer:
You add by 5, then 15, then 45 and so on
Step-by-step explanation:
First, you add 5, then you add 15, then you add 45 and so on. You are multiplying 3 and 5 every-time. I don't really know how to explain it but ya.
To get from 3 to 8, add 5. To get from 8 to 23, add 15. You're multiplying by 3 for every number. (I'm super bad at explaining)