An initial sample of 199 g of a radioactive substance decays according to the function A(t) = 199e-0.026t where t is given in years. (a) How many grams of the substance will remain after 143 years? Round your answer to one decimal place. (b) What is the half-life of the substance? Round your answer to one decimal place.

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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Question 17
An initial sample of 199 g of a radioactive substance decays according to the function A(t) = 199e
where t is given in years.
(a) How many grams of the substance will remain after 143 years? Round your answer to one decimal place.
> Next Question
(b) What is the half-life of the substance? Round your answer to one decimal place.
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Transcribed Image Text:ab Question 17 An initial sample of 199 g of a radioactive substance decays according to the function A(t) = 199e where t is given in years. (a) How many grams of the substance will remain after 143 years? Round your answer to one decimal place. > Next Question (b) What is the half-life of the substance? Round your answer to one decimal place. esc ! 1 < OO Q > 2 26 W 280 a #3 E DEC 2 DE 69 t 4 R do LO % 5 tv ♫♬ NO T -0.026t MacBook Pro < C 6 & 7
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