A radioactive element decays at a rate of 5% annually. there are 40 grams of substance present. How much substance remains after 30 years. (the nearest 10th)
When will the amount of substance drop below 20 grams (to the nearest year) ?
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Home » Mathematics » A radioactive element decays at a rate of 5% annually. there are 40 grams of substance present. How much substance remains after 30 years. (the nearest 10th) When will the amount of substance drop below 20 grams (to the nearest year) ?