Determine if the ordered pairs represent a linear, quadratic, or exponential function.
1. (-2, 4) (-1,1) (0,0) (1,1) (2,4)
2. (-5, 2) (-4,3) (-3,4) (-2,5) (-1,6)
3. (1,2) (2,4) (3,8) (4,16) (5,32)
4. (0,0) (1,4) (2,8) (3,12) (4,16)
5. (0,1) (1,-4) (2,-9)(3,-14) (4,-19)