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)
Answer:
Which letter exactly?
Explanation:
Most likely his action to end racism?
Of the candidates in the 1860 election, the only one who tried to run for a national campaign was Douglas
Answer:
Trajan and Dacians, are the right answers.
Explanation:
The Column of Trajan played a significant role in the Forum of Emperor Trajan. This is a monument which reveals the zenith of emperor Trajan’s rule. It is a monument which depicts the victory of emperor Trajan over the barbaric Dacians whom he saw as uncivilized enemies. The Column of Trajan became a symbol of Trajan's victory over Dacians.