What is the restricted domain that will make a inverse a function

Q1 which of the following is a factor of a)37 b)53 c)62 d)82 q2) if the sum of 2016 different whole numbers is odd. at most how many of the numbers can be even a)0 b)1 c)2014 d)2015

Which of the following tables represents exponential functions?

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?