I am having a difficult problem solving a few algebra problems. I am not new to forums, but am new to this forum. Here is what I need help with.

The first part is all raised to the 3/2.

1.((16a^(-4))^3/2 * (4ab^(1/2))^-2

( b^8 )

I got an answer with a denominator.4

a^8 b^13

According to the rules, is this correct?

2.4y^(-2) -2x^(-1)

(xy)^(-1)

I am completely lost on this one. Not sure what to do after shifting the variables, to make them positive.

All help will be appreciated.