The half life of a substance is 49 years. If there are 220 mg present now, how much will remain in 58 years?

College Algebra
10th Edition
ISBN:9781337282291
Author:Ron Larson
Publisher:Ron Larson
Chapter5: Exponential And Logarithmic Functions
Section: Chapter Questions
Problem 28T: The half-life of radioactive actinium ( 227AC ) is 21.77 years. What percent of a present amount of...
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The half life of a substance is 49 years. If there are 220 mg present now, how much will remain in 58 years? 

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