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(9-7 / 27-3)4/5 = ?

Question 1:

(9^-7 / 27^-3)^4/5 = ?

A. 3^-1

B. 3^-2

C. 3^-3

D. 3^-4

Feedback (9^-7 / 27^-3)^4/5 = [(3²)^-7 / (3³)^-3]^4/5

= (3^-14 3⁹)^4/5 = 3^-4 .

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