Simplify and evaluate: (x^3y^-1z^6/2x^-3y^8)^5?

Answer 1

I think it's:
z^15y^14
but I don't know for certain.

Answer 2

You will find my answer here:

http://img172.imageshack.us/img172/892/simplifyty6.png

EDIT: Correction to my result: the constant 2 should also be raised to the 5th power, so the denominator should be 32*y^45, not 2*y^45