Respuesta :

sqdancefan

Answer:

  D.  5^8/9^18

Step-by-step explanation:

The applicable rule of exponents is ...

  (a^b)^c = a^(bc)

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  [tex]\left(\dfrac{5^4}{9^9}\right)^2=\dfrac{5^{4\cdot 2}}{9^{9\cdot 2}}=\dfrac{5^8}{9^{18}}[/tex]

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