You need to first learn the meaning of the words "domain" and "range".
Each of these words represent some set of numbers.
Go look up their definitions. (If you cannot understand a definition, come back here and post it, along with your specific question about it.)
Once you understand the meaning of "range", the answer to this exercise will be obvious to you.
Need more help, after studying the definitions? Then come back here and tell us WHY.
Cheers :cool: