Respuesta :

Answer:

-20.

Step-by-step explanation:

Hope this helps!

Answer: -20

Step-by-step explanation:

5^-1 is what (5^-4 x 5^3) will equal to.

In order to make it 5^20, you must multiply -20 as an exponent to the expression of 5^-4 x 5^3

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