Answer:
[tex] {5}^{ - 7} [/tex]
Step-by-step explanation:
You have to use the property of quotient of powers, you subtract the power of the fraction denominator from the numerator
[tex] \frac{ {5}^{ - 4} }{ \frac{5}{3} } [/tex]
[tex] {5}^{ - 4 - 3} [/tex]
[tex] \frac{1}{ {5}^{7} } [/tex]
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