To convert the length from feet to yards, you need to know the conversion factor: there are 3 feet in a yard. Therefore, to convert a length \( n \) in feet to yards, you will divide \( n \) by 3.
The function rule that represents the length of the field in yards as a function of the length in feet \( n \) is:
\[ f(n) = \frac{n}{3} \]
This means for every foot \( n \), the length in yards \( f(n) \) will be one-third of that value.
Neither \( ƒ(n) = 12n \) nor \( ƒ(n) = 3n \) is correct for this conversion. The correct function is \( f(n) = \frac{n}{3} \).
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