This can be written as:
[tex]40 \leq n - 2[/tex]
"No greater than" does not necessarily mean less than, but it just means it cannot go over. So equal to or less than.
"The difference of a number and 2" can be represented as "n - 2"
If you were to solve this inequality, you would end up getting:
[tex]42 \leq n[/tex] or [tex]n \geq 42[/tex]
Hope this helps! :)