Example problem on half-life calculations for a substance with a 10-year half-life, showing how much remains after 10, 20, and 35 years.
A whiteboard with handwritten notes on half-life calculations, showing an example problem with 400g of a substance and a half-life of 10 years, calculating remaining amounts after 10, 20, and 35 years using the formula A = 400(1/2)^(t/10).
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