The rule that maps each domain value to its range is f(x) = x/2
The table of values that complete the question is added as an attachment
From the attached table of values, we can see that:
The x value is divided by 2 to get the y value
i.e.
y = x/2
Represent as a function
f(x) = x/2
Hence, the rule that maps each domain value to its range is f(x) = x/2
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