Answer-
I don't know what you want me to do with that, but I'll give you the equation and the answer of it:
Equation: 11 ≥ (4×n)-9
Answer: n could be five and below. For example, 5, 4, 3, 2, and 1 could work
Explanation-
If you take one of the numbers I used in the example and plugged it in, it would kinda look like this:
11 ≥ (4×4)-9
4×4=16
16-9=7
Since it said at most 11, this would be reasonable because 11 ≥ 7.