# Growth & Decay Exponential Functions

Videos and lessons to help High School students learn how to distinguish between situations that can be modeled with linear functions and with exponential functions.

C. Recognize situations in which a quantity grows or decays by a constant percent rate per unit interval relative to another.

Common Core: HSF-LE.A.1

Write the exponential growth function - F-LE.1
In this lesson, you will learn how to write the exponential growth function modeling a percent of increase situation by the percent of increase as a growth factor.

Write the exponential decay function - F-LE.1

In this lesson, you will learn how to write the exponential decay function modeling a percent of decrease situation by the percent of decrease as a growth factor.

Ex: Exponential Growth Function - Bacterial Growth
This video explains how to determine an exponential growth function from given information. Then it explains how to determine when a certain population will be reached.

Ex: Exponential Decay Function - Half Life.
This video explains how to determine an exponential decay function from given information. Then it explains how to determine when a certain level of decay will be reached and how to determine half-life.

Exponential Growth App (y=abt) - Given Doubling Time
This video explains how to determine an exponential function in the form y=a*b^t given the doubling time. The it determines a population after a given amount of time.

Ex: Exponential Growth Regression Model (Investment Account)
This video provides an example of how to perform exponential regression on the TI84 graphing calculator and answers a variety of related questions.

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