we need to check each option repalcing x=3 to obtain 125
1.
[tex]\begin{gathered} f(x)=x^5 \\ f(3)=3^5 \\ f(3)=243 \end{gathered}[/tex]
Wrong
2.
[tex]\begin{gathered} f(x)=25x \\ f(3)=25(3) \\ f(3)=75 \end{gathered}[/tex]
Wrong
3.
[tex]\begin{gathered} f(x)=5^x \\ f(3)=5^3 \\ f(3)=125 \end{gathered}[/tex]
Right, then the option is third
the we dont need to check last option
