The function value of f(12) is 27.
It should be noted that a function is simply used to show the relationship that exists between the variables.
Therefore, based on the information, the function f(12) will be:
3x - 9
f(12) = 3(12) - 9
= 36 - 9
= 27
The function value is 27
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Complete question:
If f(x) = 3x - 9. Find the function value of f(12).