Answer:
72
Step-by-step explanation:
This is because of how many pins they each knock down. 72 is the lowest common number they share.
8,16,24,32,40,48,56,63,<u>72</u>,80
9,18,27,36,45,54,63,72,81
slope is 2
Slope Formula:
=
36
Do the keep change flip and it will probably give you 1 too
:)