Answers: 2
(1)
is the final amount of the material
is the initial amount of the material (the quantity we are asked to find)
is the time elapsed
is the half life of cobalt
(2)
>>> This is the amount of grams in the original sample 
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The half-life of cobalt is 5.26 years. if 10 grams are left after 15.78 years, how many grams were i...
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