if you were to fill a graduated cylinder to 250 mL then drop an object in that raises the water level to 300 mL, what is the volume of the object, in cubic centimeters?

50cc. The conversion rate is 1ml to 1cc so you simply subtract the level in the cylinder before the object (250ml) from the level after dropping in the object (300ml) to find the difference, or the change. And then you multiply that figure by a factor of one because 1ml is equal to 1cc.