f.3mathz

1) By using the indentity (a^x)^y=a^(xy)
(f^6)^3
=f^18
2)Use the identity (a/b)^x=(a^x)/(b^x)
(r^2/s^3)^4
=[(r^2)^4]/[(s^3)^4]
Now use the identity in 1)
=r^8/s^12
3) Use the identity (ab)^x=(a^x) x (b^x)
(2ab^4)^4
=2^4 x a^4 x (b^4)^4
=16a^4b^16

1) f^18

2) r^8/s^12

3) 16a^4b^16