Which graph matches the equation: y = -2X -1

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.)

He concluded that a heavier object dropped from the same height as a lighter object will land

What is the greater volume 72 quarts or 23 gallons