# A specific radioactive substance follows a continuous exponential decay mode. It has a half-life of 16…

A specific radioactive substance follows a continuous exponential decay mode. It has a half-life of 16 days. At the start of the experiment, 61.7 g is present. Din (a) Lett be the time (in days) since the start of the experiment, and let y be the amount of the substance at time. Write a formula relating y toi. Use exact expressions to fill in the missing parts of the formula Do not use approximations X ? (b) How much will be present in 9 days? Do not round any intermediate computations, and round your answer to the nearest tenth