a number ,n, plus is less than 34

Answer 1

A number n plus [something] is less than 34:

n + [something] < 34

You left out the [something] from the problem statement, so you can just fill it in above. If the problem asks you to solve for n, then just subtract [something] from both sides:

n < 34 - [something]

Answer 2

Did you write all of the question?