The decay equation is of the form

where
m(t) = the mass remaining after t minutes
m₀ = the initial mass
k = constant
Because the half-life is 3 minutes, therefore

Therefore
-3k = ln(0.5)
k = ln(0.5)/(-3) = 0.231
Because m₀ = 16 mg, the time, t, for the mass to decay to 1.0 mg is given by

Answer: 22 min (nearest integer)
Yes the end of the 20th century was also the end of Western dominance in world history.
<span>Italian nationalist Garibaldi showed great perserverance by returning to Italy after a failed attempt against the Austrians, only to: </span><span>lead the next revolution to unify Italy
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Giuseppe Garibaldi was a military general that played the most important role in the unification of Italy. Because of his achievement, The Italian people called him "fathers of the fatherland"