Questions from my textbook i had trouble with, thanks

Simplify,

1.i (4x^2y^2)^2 + 2(x^2y)^4

ii. (x^2+y^2)/x^-2+y^-2

2.Find n

i (3^(n-2)) / (9^(2-n)) = 27

ii 2^(n-4) = 8^(4-n)

iii. 8^(6n+2) = 8^(4n-1)

iv. (27*(3^n))^n = 27^n * 3^(1/4)

3. Find x

16^x = 1024

Thanks alot