find f(x)+g(x)and f(X)-g(X).simplify your answer.

1.) f(x)=3x^3-2x^2+5x-1,g(x)=x^2+7x-1

2.)f(x)=4x^2/3,g(x)=3x^2/3

3.) f(x)=2x^3-3x+4,g(x)=x^2+5x-1

4.) f(x)1/2x^3/4,g(x