Question

below is the table of values of a function. write the output when the input is n.
input output
1 3
5 15
7 21
n

Explanation:

Step1: Analyze the relationship between input and output

For input \(1\), output is \(3\), and \(1\times3 = 3\). For input \(5\), output is \(15\), and \(5\times3=15\). For input \(7\), output is \(21\), and \(7\times3 = 21\).

Step2: Determine the function rule

From the above analysis, we can see that the output is three times the input. So if the input is \(n\), the output should be \(3\times n\) or \(3n\).

Answer:

\(3n\)