Answer:
option C)
1/81
Step-by-step explanation:
Given in the question an expression,
[tex]9^{-2}[/tex]
Apply negative exponent rule which says
[tex]x^{-n} = \frac{1}{x^{n} }[/tex]
So,
[tex]9^{-2} = \frac{1}{9^{2} }[/tex]
As we know that 9² = 9x9 = 81
= [tex]\frac{1}{9x9}[/tex]
= [tex]\frac{1}{81}[/tex]
So, the expression 9^-2 = 1/81
