Some exercises related to domain and range

Determine domain and range of the following functions:
Exercise 1: f  x  = x − 2, g  x  = −2 x
f  x  = x
2 − 4, g  x  = − x
2  4
f  x  = x
2 − 2, g  x = −0.5 x
2  2 x
f  x  = x
3
, g  x  = − x
3  4 x
2 − 4 x
f  x  =  x , g  x  =  x − 2
f  x  =  x  2 , g  x  =  x − 2  1