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### Course: Algebra (all content) > Unit 11

Lesson 17: Introduction to rate of exponential growth and decay# Exponential growth & decay word problems

How do you solve word problems involving exponential growth and decay? In this video, you will learn how to use a table and a formula to find the percentage of a radioactive substance that remains after a certain time. You will also see how a common ratio, which is the factor by which the quantity changes every time period, determines the rate of change. You will use a calculator to apply the formula and get the answers. Created by Sal Khan and CK-12 Foundation.

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