When the length of a field in feet is a function f(n) of the length n in yards then the function rule is option (D) f(n)=3n
What is Function?
In mathematics, a function from a set X to a set Y assigns to each element of X exactly one element of Y
What is yard?
The yard is an English unit of length
What is feet?
A unit of length in the customary system
Length of a field in feet is f(n)
where n is the length in yards
We know that 1 yard = 3 feet
therefore function f(n)=3n
Hence, when the length of a field in feet is a function f(n) of the length n in yards then the function rule is option(D) f(n)=3n
Learn more about Function, Feet and yard here
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