1. The problem statement, all variables and given/known data Given that I have a doubling function : f(x)=2x (for 0≤x<0.5) and 2x-1 (for 0.5≤ x<1) 2. Relevant equations What is f(f(x))? 3. The attempt at a solution f(f(x))=4x for the first one and 4x-3 for the second part but not sure what to do about the domain constraints... Thanks!!