Back to 6.7 Exponential and Logarithmic Models

6.7 Exercise 58

Avg difficulty 2.5

Use this scenario: A tumor is injected with $0.5$ grams of Iodine-125, which has a decay rate of $1.15%$ per day.

The half-life of Erbium-165 is $\text{10} .\text{4}$ hours. What is the hourly decay rate? Express the decimal result to four decimal places and the percentage to two decimal places.

OpenStax Algebra and Trigonometry 2e, 6.7 Exponential and Logarithmic Models, exercise 58

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Adapted from College Algebra © 2021 Rice University. Licensed under CC BY 4.0. Sources: College Algebra 2e, Algebra and Trigonometry 2e, Precalculus 2e, College Algebra with Corequisite Support 2e. Imported at revision 4922e46.