A = {- 2,-1, 1, 2}, f=`{(x, 1/x ):x in A}`. List the domain and range of f

If A={-2,-1,1,2} and f={(x,1/x):x} Find :Is f a function?

Let A={1,2,3} and B={2,4,6,8} . Consider the rule f:A to B,f(x)=2x,AA x in R . Find the domain, codomain and range of f.

Find the domain and range of f if . f(x)=1/(x^2-1)

Find the domain and range of f if . f(x)=sqrt(1-x)

Find the domain and range of f if . f(x)=1/(x(x-1))

Find the domain and range of f if . f(x)=|x+1|/(x+1)

Find the domain and range of f if . f(x)=x^2/(x^2+1)

Find the domain and range of f if . f(x)=1/sqrt(9-x^2)

Find the domain and range of f if . f(x)=(x+2)/(x^2-8x-4)

Find the domain and range of real function f if f(x)=x/|x|