Can someone please help me with this Algebra: It deals with Rational Functions.

1) What is the quotient 9 - x^2/2x^2+5x -3 divided by 5x-15/5x- 5? State any restrictions on the variable.

2) A box has a volume of x^3 -16x cm^3. Another box has a volume of x^3 - 4x^2 cm^3.
What is the ratio of the volume of the first box to that of the second?

I am really stuck on how to do these, and if you could explain how to do them step by step that would be great! Please don't say do your own homework because it's just these 2 problems I need help with.

Question

Can someone please help me with this Algebra: It deals with Rational Functions.

1) What is the quotient 9 - x^2/2x^2+5x -3 divided by 5x-15/5x- 5? State any restrictions on the variable.

2) A box has a volume of x^3 -16x cm^3. Another box has a volume of x^3 - 4x^2 cm^3. 
What is the ratio of the volume of the first box to that of the second?

I am really stuck on how to do these, and if you could explain how to do them step by step that would be great! Please don't say do your own homework because it's just these 2 problems I need help with.