The amount of a sample remaining after t days is given by the equation P(t) = A1121.5 days2.5 days9.4 days21.1 days.where A is the initial

The amount of a sample remaining after t days is given by the equation P(t) = A1121.5 days2.5 days9.4 days21.1 days³.where A is the initial amount ofthe sample and h is the half-life, in days, of the substance. A sample contains 18% of its original amount of Radon-222. The half-life of Radon-222 is about 3.8 days. Which is the best estimate for the age of the sample?