Let R represent the mass of radioactive R (an
imaginary element) in grams, whose half-life is 16,000 years. The quantity of R present after
t years is R(t)=14(1/2)^{t/1}^{6}^{,}^{0}^{00}.

a)What is the initial quantity of R? (round to the nearest whole gram)

b)What is the quantity of R present after 12,000 years? (round to the nearest tenth of a gram)