Question 1143966:  Write a function rule for the input-output table -- Input - 0, 1, 2, 3 and Output - 5.2, 4.2, 3.2, 2.2 
 Answer by ikleyn(52898)      (Show Source): 
You can  put this solution on YOUR website! . 
f(n) = 5.2 - n,  where  n = 0, 1, 2, 3.
It is one possible, but not a universal function rule.
There are INFINITELY MANY (actually, a continuum) other rules.
 
 
 
 
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