Please help me this is due today.

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.)

Given abcd ac=38 and ae=3x+4 find the value of x

How to use order of operation in 20 divide by 4 multiply 5 = 1