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Exponential Functions

Exponential Functions 1.20 - Solution

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a

An exponential function can in general be written in the form where is the function's value when year We know that which means that the amount Billy G invested was

b

specifies the exponential function's growth factor. In our model, which means that the investment is expected to increase by per year.

c

According to the model, dollars is the size of Billy G's investment, years after Therefore,

that the amount in the fund is approximately years after which means year