Step-by-step explanation:
Because a^m / a^n = a^(m-n),
we have 5³ / 5⁷ = 5^(3-7) = 5^(-4).
Answer: 1.6 x 10^-3
= 1/5^4
=1/625
=0.0016 = 1.6 x 10^-3
