Which is the value of this expression when p=3 and q=-9? ((9^-5)(p^4))^3 times ((p^-4)(q^3))^0

For this case we have the following expression:
 ((p ^ -5) (p ^ 4)) ^ 3 * ((p ^ -4) (q ^ 3)) ^ 0
 Rewriting we have:
 ((p ^ -5) (p ^ 4)) ^ 3 * ((p ^ (- 4 * 0)) (q ^ (3 * 0)))
 ((p ^ -5) (p ^ 4)) ^ 3 * ((p ^ 0) (q ^ 0))
 ((p ^ -5) (p ^ 4)) ^ 3 * ((1) (1))
 ((p ^ -5) (p ^ 4)) ^ 3 * 1
 ((p ^ (- 5 * 3)) (p ^ (4 * 3)))
 ((p ^ -15) (p ^ 12))
 p ^ (- 15 + 12)
 p ^ -3
 1 / p ^ 3
 For p = 3 we have:
 1/3 ^ 3
 1/27
 
 the value of this expression is:
 1/27