Respuesta :

Nevens

Answer:

a^-7

Step-by-step explanation:

we need to know that :

[tex]\frac{a^{b} }{a^{c} } =a^{b-c} \\[/tex]

so the ans is

[tex]a^{(-13)-(-6)} = a^{-7}[/tex]

by the way

[tex]\muti{a^{b} }{a^{c} } =a^{b+c} \\[/tex]