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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 $4\left(1\right)$, or $4$. Therefore, the predicted volume, in milliliters, draining from the container each second is $4$ milliliters.

Choice A is incorrect. This is the amount of liquid, in milliliters, in the container before the liquid begins draining.

Choice B is incorrect and may result from conceptual errors.

Choice C is incorrect and may result from conceptual errors.