Explanation
Step 1
Write 1/7to the 6th power, it is
6th power means the number multiplied by itself 6 time
[tex](\frac{1}{7})\cdot(\frac{1}{7})\cdot(\frac{1}{7})\cdot(\frac{1}{7})\cdot(\frac{1}{7})\cdot(\frac{1}{7})=(\frac{1}{7})^6[/tex]Step 2
with a negative exponent
the exponent is 6 , so
[tex]\begin{gathered} 6\leftrightarrow-6 \\ \text{then} \\ (\frac{1}{7})^{-6} \\ \end{gathered}[/tex]