Answer:
The correct choice is option A. 7^15 / 3^30
Step-by-step explanation:
(3^-6 / 7^-3) ^ 5
(3^-6)^5 = 1 / 3^30
(7^-3)^5 = 1 / 7^15
= (1 / 3^30) / (1 / 7^15)
= 7^15 / 3^30
