Decaying car sales ... when should the advertising resume? The last video in a series of 31 works a problem involving exponential decay. The problem presents the scenario of declining car sales in which the rate is not given directly to determine when to restart the advertisements. The presenter shows the steps needed to determine the rate of decline and then how to use that to find the time based on the constraints in the problem.

Concepts

exponential decay, exponential functions, exponential models

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Additional Tags

math

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Instructional Ideas

• Lead a review covering the properties of logarithms and how to evaluate using a calculator
• Extend the problem to determine when to stop the advertisements

Classroom Considerations

• Pupils should be comfortable working with exponential functions

• This video is hosted on YouTube

Pros

• Reminds the class of the formula used for exponential decay
• Shows the algebraic manipulations of the exponential and logarithmic functions

Cons

• None

Common Core

HSF-BF.B.5 HSF-LE.A.4 MP4 MP5