Differentiation Questions

Can someone please help me with these 2 questions.

1. f (x) = 7/x^4 - 3/x^3 + 1/x^(1/3)

the answer i get is:

-28/x^5 + 9/x^4 ... but the third part is killing me... can someoen help me differentiate the lsat part of this question... I know the answer but i need to understand how to get there.

2. f (x) = x^4 + 2x^2 - x + 3 / x

I have no idea what i'm doing wrong in this question... do we treat it using the quotient rule? Can someone show the steps for this as wel.

Thanks :)