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Art of Problem Solving
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and language arts learners in grades 2-12.
is a linear function with slope 
,
![\[m = \frac{f(6) - f(2)}{\Delta x} = \frac{12}{6 - 2} = 3\]](http://latex.artofproblemsolving.com/a/a/2/aa203aedcd175b965d80f840ac73c7f9356e3456.png)
![\[f(12) - f(2) = m \Delta x = 4(12 - 2) = 30 \Rightarrow \text (D)\]](http://latex.artofproblemsolving.com/c/d/c/cdc31f45fb1779b7e68669b031b809d19e97db40.png)
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