Final answer:
To calculate f(3) for the function f(n) = 3n, we substitute n with 3 to get f(3) = 3 × 3, which equals 9.
Step-by-step explanation:
To find f(3) when the function is given by f(n) = 3n, substitute the value of n with 3, which yields f(3) = 3 × 3. The operation required is to multiply 3 by 3.
The multiplication of 3 by 3 gives us 9. Therefore, f(3) = 9, which corresponds to option C) 03 in the student's potential answers.