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An element with mass 670 grams decays by 21.8% per minute. How much of the element is remaining after 15 minutes, to the nearest 10th of a gram? round
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Use A = A0(1 − r)^t with r = 0.218, t = 15:
A = 670(0.782)^15 ≈ 670(0.0250093) ≈ 16.7562 g.
Rounded to the nearest tenth: 16.8 g.
A = 670(0.782)^15 ≈ 670(0.0250093) ≈ 16.7562 g.
Rounded to the nearest tenth: 16.8 g.
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