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3.
Radium radioactively decays according to the
function
-0.004
R(t)=Roe
where Ro is the original sample amount and
R(t) is the final amount remaining after 1 years.
Beginning with a 14 mg sample, how much
remains after 10 years?
(A) 13.45 mg
(B) 14.75 mg
(C) -1.52 mg
(D) 13.94 mg
(E) None of the above