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A certain radioactive isotope has a half life of 5 years. If a sample has 120 grams of radioactive material, what equation could be used

A certain radioactive isotope has a half life of 5 years. If a sample has 120 grams of radioactive material, what equation could be used to determine the amount of material remaining (y) after x years. 5x O y= 120 x y=60 3x O y=120x5 Oy= =x120 -3

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