1.If a = 2 + i, and b =3 - 2i, what is b/a?

2.What are the possible rational roots of f(x) = x⁴- 173x³- 16x²- 7x - 15, according to the rational root theorem? "" means "plus or minus".

3.What is i^-3?

4.What are the possible rational roots of f(x) = 5x⁴- 173x³-16x²-7x -15, according to the rational root theorem?"+-" means "plus or minus".

5.As x goes to minus infinity, the graph of f(x) = 5x4 - 173x3 - 16x2 - 7x - 15 goes to (points in) what direction?