The document discusses Newton's Law of Cooling and provides an example of using it to solve problems. Specifically, it states that a roast initially at 68°F was placed in a freezer at 20°F, and after 2 hours its temperature was 40°F. It then asks (a) what the temperature of the roast will be after 5 hours, and (b) how long it will take for the roast's temperature to fall to 21°F.