Answer:
The rule is "Subtract 9"
n = 11
Explanation:
To find the rule you have to find what's common with all of them. This requires a little bit of testing.
THINK
Do I divide by 10? No because it doesn't work for all of them.
Do I divide by 4? No because it doesn't work for all of them.
Do I subtract by 9? Yes because it works for all of them.
Rules can be a lot of things. Subtraction, multipilcation, division, addition, or with variables.