He died and after hello died his son took his place and took over Rome
10.2 hours is equivalent to three half-lives, so after 10.2 hours, the mass of the sample would have decayed by half three times over. If one starts with 100 mg of the sample, then after three half-lives, there would be 100(0.5)³ = 12.5 mg of the sample remaining.
Thus, the correct answer choice here would be D.
D after dinner. if you have multiple things to do and are committed and determined. always make time for the things you feel most important to you, studying has to be done and if there no time during the day, make time. if not then before bed. atleast you can say its done and you did it. hope that helps. its just my honest opinion from my common sense and knowledge