Question

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

• miles he runs.
• months he runs.
• miles he ran the first day.
• calories he burns.

Explanation:

The equation $f(x)=0.5 + 2x$ models Sean's running progress. The initial value 0.5 is his first run distance (0.5 miles). The term $2x$ corresponds to adding 2 miles per month, so $x$ must represent the time period (months) over which he increases his runs.

Answer:

months he runs.