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An experiment at a college started years ago with 32 /9 grams of a radioactive material. Last year, only 2 grams of the substance remained,

An experiment at a college started years ago with 32 /9 grams of a radioactive material. Last year, only 2 grams of the substance remained, and this year (exactly 1 year later), only 3/2 grams of the substance remain. 


a) How many years ago did the college start the experiment? 

b) What is the half-life of the radioactive material?

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