Write (27a^-9)^2/3 in simplest form

2 to the second power times a to the negative four power 

four times a to the negative four power

2(2)*a(-4)

4a(-4)

Or if you can't use negatives

4

a(4)

Four overtop a to the fourth power 

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?