Use area models to multiply

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.)

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

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with