Answer:
A. 2
----------
3x^3 y^5 z
B. 49k^8 m^6
--------------------
81
C. a^9 b^3
---------------
27c^12
D. -125y^9
--------------
x^6
Explanation:
A.
12x^2 y^-4 2
----------------- = -----------
18x^5 yz 3x³y^5z
B.
(9k^2 m)^-2 -81k^-4 m^-2 49k^12 m^8 49k^8 m^6
--------------- = ---------------------- = --------------------- = --------------
(7k^6m^4) -49k^-12 m^-8 81k^4 m^2 81
C.
( 4a² b² )³ 64 a^9 b^6 a^9 b^3
------------------- = ------------------------- = -------------
( 12a^-1 bc^4 )³ 1728 b^3 c^12 27c^12
D.
( -5x^-2 y³ )³ = -125 x^-6 y^9 = -125y^9
---------------
x^6
I hope this helps!