Answer:
[tex]5(7^{-2})[/tex]
Step-by-step explanation:
Observe that the expression of the last option is equivalent to [tex]5*\frac{1}{7^{2} }[/tex] by the laws of exponents [tex]a^{-b} = \frac{1}{a^{b}}[/tex].
Further, [tex]7^{2} = 49[/tex] so [tex]\frac{5}{49} = 5 * \frac{1}{49} = 5* \frac{1}{7^{2}} = 5* (7^{-2})[/tex]
