The half-life of a radioactive kind of carbon is 20 minutes. If you start with 480 grams of it, how much will be left after 60 minutes?

Hassan bought a package of tofu. the temperature of the tofu was 14° celsius when hassan put the package into the freezer. he left the tofu in the freezer until it reached –19° celsius. which expressions explain how to find the change in temperature, in degrees celsius, of the package of tofu? select three that apply.