Pls do dis for me :>

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.)

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x