Please help me whit this (if you answer pls show the work)

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.)

How many square feet of out door carpet will we need for this hole? 8ft 3ft 12ft 4ft

Find the vertex of the function given below y=x^2-6x+1