SAT Question 1bc11c4e: Linear Functions answer and explanation with Desmos solution

Choice A is correct. It's given that the function $g$ models the number of gallons that remain from a full gas tank in a car after driving $m$ miles. In the given function $g\left(m\right)=-0.05m+12.1$, the coefficient of $m$ is $-0.05$. This means that for every increase in the value of $m$ by $1$, the value of $g\left(m\right)$ decreases by $0.05$. It follows that for each mile driven, there is a decrease of $0.05$ gallons of gasoline. Therefore, $0.05$ gallons of gasoline are used to drive each mile.