Question 529595
You have a set of (x, y) value pairs that relates each first number (x) to a value for the second number (y).
This represent a relation that gives you a y for each x, so it could be thought of as a function y=f(x).
We consider the set of x values {-7, 3, 7} the domain.
The set of y values that result from applying that function is the range.