1. The problem statement, all variables and given/known data I have to find the range of f(x) where: f(x)=7*floor(x) - floor(7*x) x is a real number. Then I have to prove that this set of numbers is correct. 3. The attempt at a solution I am still on the range part, and thus am only asking about that part at the moment. It seems to me that the range of f(x) would be (-infinity,+infinity). Is there a reason that it wouldn't be?