Help, plss with explanation, thx

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.)

Which of the choices shown could be used to prove that aacp=abcp ?

Select the graph of the solution. click until the correct graph appears. |x| = 3