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)
There is no document attached? I’m sorry but we can’t help unless we can read the document.
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They learned how to farm, sew clothes using animal hides, hunt, sheltar, make more complex tools and found new uses for them, pottery, tame dogs, build canoes, and control fire
The answer is (B) because he successfully invaded Egypt