How would I rewrite each of these expressions with positive exponents and simplify them?

Question

1.(-2x^3)^3(4x^3)^-1
2.(x/10)^-1
3.(4y^-2)^3(4x^3)^-1

Answer 1

1.(-2x^3)^3(4x^3)^-1
= -8x^9/4x^3 = -2x^6

2.(x/10)^-1 = 1/(x/10) = 10/x

3.(4y^-2)^3(4x^3)^-1
= 64y^-6 /4x^3
16/(x^3y^6)