A radioactive substance decays in such a way that the amount of mass remaining after t days is given by the function

m(t) = 9e−0.012t
where m(t) is measured in kilograms.
(a) Find the mass at time t = 0.

3 answers

I am sure you meant:

m(t) = 9 e^(-.012t)

so if t = 0 , remember that anything^0 = 1
so m(0) = 9
ALSO How much of the mass remains after 49 days? (Round your answer to one decimal place.) what would this look like just to double check?
well, I suppose I will try although really I am sure you could try first.

9 e^-(.012*49)

= 9/(e^.588)

= 9/1.8

= 5