Question

Nine less than a number n n is written as

Answer 1

If you look at the question closely, it says nine is less than a number (n), which is written as 9 < n. now the question asks what is n is written as, you could either write it as n > 9 or 9 < n.

Answer 2

"Less than" means subtraction

The order they appear in tells me to subtract 9 from N.

n - 9