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Math Help - Finding a function for a table

  1. #1
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    Finding a function for a table

    I have tried to find just one function for this table and cannot. I have tried adding, subtracting, multiplying, dividing and exponential. This is my son's 5th grade math question and I am being dense. Can you please help me find a formula?
    Input Output
    3 21
    6 42
    9 27
    12 36

    Thank you!!
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  2. #2
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    Crna Gora
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    Re: Finding a function for a table

    Quote Originally Posted by pj389 View Post
    I have tried to find just one function for this table and cannot. I have tried adding, subtracting, multiplying, dividing and exponential. This is my son's 5th grade math question and I am being dense. Can you please help me find a formula?
    Input Output
    3 21
    6 42
    9 27
    12 36

    Thank you!!
    f(3n) =\begin{cases}21\cdot n, & \text{if }n \in \{1,2\} \\9 \cdot n, & \text{if }n \in \{3,4\}\end{cases}
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