The half-life of Palladium-100 is 4 days. After 16 days a sample of Palladium-100 has been reduced to a mass of 4 mg. What was the initial mass (in mg) of the sample? What is the mass (in mg) 6 weeks after the start? You may enter the exact value or round to 4 decimal places.

A volatile liquid evaporates in the air in a manner that causes 15% to be lost ev- ery 4.25 hours. If 200 mL of this liquid is in an open container initially and left to evaporate, determine the following. How much of the liquid will remain after 48 hours? How long will it take for 180mL of the liquid to evaporate? Round each response to the nearest whole number. mL hours

Does 2/3 equal 0.666? If not, which is larger? By how much?