Answer:
[tex]f(n) = \frac{n}{3} [/tex]
Step-by-step explanation:
Recall that:
[tex]3ft = 1 \: yd[/tex]
This implies that:
[tex] 6ft = 2yds[/tex]
[tex] 9ft = 3yds[/tex]
In general:
[tex] n \: ft = \frac{n}{3} \: \: yds[/tex]
We can therefore write the function rule:
[tex]f(n) = \frac{n}{3} [/tex]