Answer:
D
Step-by-step explanation:
Using the rule of exponents
[tex]a^{-m}[/tex] ⇔ [tex]\frac{1}{a^{m} }[/tex]
Given
[tex]6^{-3}[/tex]
= [tex]\frac{1}{6^{3} }[/tex]
= ([tex]\frac{1}{6}[/tex] )³