Which of the following equations demonstrates that the set of polynomials is not closed under the certain operations

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 expression will have the same sum as 3_8 + 1/4?

Finding tbe values of the variables in each kite