1. Domain: {-1, 0, 1, 2}
Range: {2, 1, 2, 5}
Function
2. D: {1, 3, 5}
R: {2, 4, 6, 8}
Not a function . (bc in the domain, the '3' is used more than once)
3. f (3)= 2 (3) - 4
f (3)= 6-4
f (3)= 2
4. f (-5) = 2 (-5) - 4
f (-5) = -10 - 4
f (-5) = -14
5. f (2) + f (4) = f (6)
f (6) = 2 (6) - 4
f (6) = 12-4
f (6) = 8
(not sure about this one)