Sean began jogging to live a healthier lifestyle. On his first run, he ran one-half mile. He increased his workouts by adding two miles a month to his run. He wrote the equation f(x)= 0.5 + 2x to model his progress. The variable x represents the number of

In f(x) = 0.5 + 2x, the 0.5 is the distance Sean ran on his first run, and the 2 means his distance increases by 2 miles for each month. Therefore, x represents the number of months he runs. Choice C, “months he runs,” is correct.

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