On January 1, 2015, a city's minimum hourly wage was $\$9.25$. It will increase by $\$0.50$ on the first day of the year for the next 5 years. Which of the following functions best models the minimum hourly wage, in dollars, $x$ years after January 1, 2015, where $x=1,2,3,4,5$?
Difficulty: Easy
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