The given expression is 7^-2
- 2 is the exponent in this case
recall this rule of exponents,
[tex]\begin{gathered} a^{-\text{ n}}\text{ = }\frac{1}{a^n} \\ \text{This means that } \\ 7^{-\text{ 2}}\text{ = }\frac{1}{7^2} \\ =\text{ }\frac{1}{49} \end{gathered}[/tex]
