Question

Which of the following is an equivalent representation of 5^-4?
Choices:
1/256
1/64
1/16
1/625

Answer 1

Any negative exponent means it's a reciprocal, i.e.:
\[
a^{-b}=\frac{1}{a^b}
\]So:
\[
5^{-4}=\frac{1}{5^4}
\]Try it, now.