Answer:
(d) 1/5^7
Step-by-step explanation:
The applicable rule of exponents is ...
(a^b)/(a^c) = 1/(a^(c-b))
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[tex]\dfrac{5^{-4}}{5^3}=\dfrac{1}{5^{3-(-4)}}=\boxed{\dfrac{1}{5^7}}[/tex]
