4(x^-10y^9)^-7 Simplifies to ??

Question

4^number x^number y^number

Answer 1

if 4^1 was wrong, then the answer key was in error.
Or, more likely, you mistyped the problem, which was supposed to be
(4x^-10y^9)^-7 = 4^-7 x^70 y^-63

Answer 2

4(4x^-10y^9)^-7

Answer 3

what would they be then