Answer:
see explanation
Step-by-step explanation:
Using the rule of exponents
[tex]a^{-m}[/tex] = [tex]\frac{1}{a^{m} }[/tex], then
(a)
[tex]4^{-1}[/tex] = [tex]\frac{1}{4}[/tex]
(b)
[tex]2^{-3}[/tex] = [tex]\frac{1}{2^{3} }[/tex] = [tex]\frac{1}{8}[/tex]
(c)
[tex]3^{-4}[/tex] = [tex]\frac{1}{3^{4} }[/tex] = [tex]\frac{1}{81}[/tex]
