What time is five hours and 15 minutes after 9: 50 am

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

Find the arc length of the semicircle. 7the grade