The basics of exponential functions are given in this question.
A decaying exponential function is modeled by:
[tex]A(t) = A(0)(1 - r)^t[/tex]
In which:
An increasing exponential function is given by:
[tex]A(t) = A(0)(1 - r)^t[/tex]
With r as the growth rate.
More can be learned about exponential functions at https://brainly.com/question/25537936