Question: From the textbook: Assume a substance has a half - life of 1 8 years and the initial amount is 1 3 8 grams. How

From the textbook:
Assume a substance has a half-life of 18 years and the initial amount is 138 grams.
How much remains at the end of 8 years? grams
How long will it be until only 15% remains? years
(Your answers should be accurate to within two and one decimal places, respectively.)
From the textbook: Assume a substance has a half

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