Answer
a) $A=50 e^{-0.14 t}$
b) $12.330$ mg
c) The year $2025$
Work Step by Step
(a) The substance decays by the formula $$
A=50 e^{-0.14 t}
$$ b) At $t=10$, we have $A=50 e^{-0.14(10)}=12.330 \mathrm{mg}$.
c) Graph the decay function and $A=5$. At approximately $t=16.45$, which corresponds to the year $2025$ .
