Question

16^-3/4

Answer 1

ok once more
the fourth root of 16 is 2 because \(2^4=16\)
then 2 cubed is 8 because \(2^3=8\)
the minus sign in the exponent means take the reciprocal, and the reciprocal of 8 is \(\frac{1}{8}\)

Answer 2

This is the same as the 4th root of (1 over 16 to the power of 3).
Negative power means reciprocality.