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2.2       Vocabulary for Exponential Decay

 

Decay

To decrease in amount or value.  The opposite of growth.

 

Decay Factor

The number used as the multiplier in an exponential decay function.   In the  expression,  , the number a,  is the decay factor.  In a decay function with a decay rate of r,   the decay factor .

 

              

 

Decay Rate

The percentage of change in an exponential decay function.   In a decay function with a factor of a, the decay rate  

 

               The decay rate is  

 

 

Exponential function

A function which changes by a percentage amount during each time period.  The rate of change, therefore is NOT constant like it is with a linear function.  Exponential functions can either exhibit growth or decay.

 

Greatest Common Factor (GCF)

The largest integer, variable or quantity factor that is a factor of all of the given terms.

 

GCF = 2                GCF = x              ; GCF = x+1

 

 ;   GCF = 120,000

 

 

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