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Mathematics
Mathematics
Problem
The mass
M
M
M
(in grams) of a radioactive substance changes according to
d
M
d
t
=
−
0.04
M
\dfrac{dM}{dt}=-0.04M
d
t
d
M
=
−
0.04
M
, where
t
t
t
is in days. If
M
=
120
g
M=120\,\text{g}
M
=
120
g
when
t
=
0
t=0
t
=
0
, calculate the mass remaining after 15 days.
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