If a radioactive substance loses 15% of its radioactivity in 2 days, what is its half-life?

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If a radioactive substance loses 15% of its radioactivity in 2 days, what is its half-life?
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Calculus

ISBN: 978-0131429246

9th edition

Authors: Dale Varberg, Edwin J. Purcell, Steven E. Rigdon

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