How do you solve these?? Have been puzzling over them since Monday. I need to pass this 8 hrs from now. Thanks! :)

1) R is a root of f(x)=x^2+x+1; what is the remainder when P(x)= x^3333-x^333+x^33-x^3+3 is divided by x/r?

2) What is the domain of the 1-to-1 function f(x)= 2^x/2 - 3; find the inverse function and its range. Then, show that the composite functions f(f^1(x)) and f^1(f(x)) are both equal to x.