) RADIOACTIVE DECAY (4.2) - A radioactive substance decays in such a way that the amount of mass remaining after t days is given by the function: m(t) = 13e −0.015t Where m(t) is measured in kilograms. a.) Find the mass at time t = 0. b.) How much of the mass remains after 10 days? c.) How much of the mass remains after 45 days? d.) What part of the function causes it to represent "decay"? e.) Would you consider this a "fast" or a "slow" decay? Why?