The half-life of a radioactive substance is 11 days. After 3 days a sample of the substance has been reduced to a mass of 7 mg. What was the initial mass (in mg) of the sample? Round your answer to 2 decimal places as needed. Using your answer from above, after how many days will there only be 0.4 mg of substance left? Round your answer to 2 decimal places as needed

The half-life of a radioactive substance is 11 days. After 3 days a sample of the substance has been reduced to a mass of 7 mg. What was the initial mass (in mg) of the sample? Round your answer to 2 decimal places as needed. Using your answer from above, after how many days will there only be 0.4 mg of substance left? Round your answer to 2 decimal places as needed

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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