<PRE><B>Question 1004321</B>
(2x^5y^-3)^4 
----
= (2^4)(x^5)^4*(y^-3)^4
----
= 16*x^20*(1/y^12)
-----
= 16x^20/y^12
---------------------
Cheers,
Stan H.
------------</PRE>