SAT Question aa85b138: Linear Equations In One Variable answer and explanation with Desmos solution

Choice B is correct. The height of the tree at a given time is equal to its height when it was planted plus the number of feet that the tree grew. In the given equation, $14$ represents the height of the tree at the given time, and $6$ represents the height of the tree when it was planted. It follows that $2n$ represents the number of feet the tree grew from the time it was planted until the time it reached a height of $14$ feet. Since $n$ represents the number of years between the given time and the time the tree was planted, $2$ must represent the average number of feet the tree grew each year.