Pls help me with these I’m literally stuck

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.)

What value of x is in the solution set of 4x – 12 s 16 + 8x?

The functions f(x) and g(x) are shown in the graph f(x)=x^2 what is g(x) ?