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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/16,000.

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

grams

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

grams

Correct!