3, 12, 21, 30, 39.... What is the arithmetic function of this sequence?
I know we add 9 to it each time but I need to figure out the function. Kind of stuck...

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What are your input values of your function, and what are your output values?

I don't have any input values. The output values are as I indicated...3, 12, 21, 30, 39...etc.

add 9 to it each time
what do you do to 3 to get each number? add 9, then 2*9 , then 3*9...

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