SAT Question 56dc8045: Linear Functions answer and explanation with Desmos solution

Choice D is correct. It's given that the function $w$ models the volume of liquid, in milliliters, in a container $t$ seconds after it begins draining from a hole at the bottom. The given function $w\left(t\right)=300-4t$ can be rewritten as $w\left(t\right)=-4t+300$. Thus, for each increase of $t$ by $1$, the value of $w\left(t\right)$ decreases by $4(1)$, or $4$. Therefore, the predicted volume, in milliliters, draining from the container each second is $4$ milliliters.