This matching question is really hard , itd be epic gamer moment if yall help me out here

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.)

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)