suppose a sample of a certain substance decayed to 77.8% of its original amount after 300 days. (round your answers to two decimal places.) (a) what is the half-life (in days) of this substance? 828.37 correct: your answer is correct. days (b) how long would it take the sample to decay to one-third of its original amount? 1312.93 correct: your answer is correct. days
