Question: sorry it's upside down, I just don't understand this problem at all. A radioactive substance decays in such a way that the amount of mass

sorry it's upside down, I just don't understand this problem at all.

all. A radioactive substance decays in such a way that the amount

A radioactive substance decays in such a way that the amount of mass remaining after t days is given by the function m(t) = 1le-0.013t where m(t) is measured in kilograms. (a ) Find the mass at time t = 0. (b) How much of the mass remains after 45 days? (Round your, answer to one decimal place.)

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