Question 901939
If you draw a vertical line anywhere, you should only cross the function at one place. 
This curve passes the vertical line test so it is a function.
Domain : min to max x values : [-4,2]
Range : min to max y values : [-3] U (1,4]

[] - these brackets denote that end values are included.
() - these brackets denote that end values are not included. 
A U B - means union of A and B.