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Question
After t years, the remaining mass y(in grams) of 20 grams of a radioactive element whose half-life is 35 years is given by
, for 
. How much of the initial mass remains after 140 years? Round your answer to two decimal places.A) 2.50 grams
B) 2.45 grams
C) 3.55 grams
D) 3.40 grams
E) 1.25 grams
Answer
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