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)
Art Criticism.
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Answer:
D
Explanation:
Because of the terroist attack on 9/11 of the twin towers.
The USA was concerned because they feared that they would launch them, this happened in a point in time where relationships between the two countries were not good and they didn't trust each other. Then when Russia had missiles in Cuba, which is close to the US, it caused the US to freak out about it, it's now called the Cuban missile crisis.
Answer:
A shifting area where pioneer settlement ended.