Question

How can I proove if the following functions are inject, surjective or bijective?

a) f(x)=x
b) f(x)=x^2
c) f(x)=x^3
d) f(x)=x/(x+2)
How can I proove if the following functions are inject, surjective or bijective?

a) f(x)=x
b) f(x)=x^2
c) f(x)=x^3
d) f(x)=x/(x+2)
@Mathematics