OG详解-OG9 数学2 Q12

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(t) = 300-4t can be rewritten as w(t) = -4t+300. Thus, for each increase of t by 1, the value of w(t) decreases by 4(1), 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.