Using an exponential function, it is found that Mary's initial investment was of $3,030.
An exponential function is modeled by:
[tex]y = ab^x[/tex].
In which:
Her investment model, in thousands of dollars, is:
[tex]M(x) = 3.03(1.28)^{2x}[/tex]
Then a = 3.03, since we measure the amount in thousands of dollars, Mary's initial investment was of $3,030.
More can be learned about exponential functions at https://brainly.com/question/25537936
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