Answer:
The exponential function that satisfies the given conditions is
.
Explanation:
If a population
is changing at a constant percentage rate
each year, then

where
is the initial value,
is expressed as a decimal, and
is time in years.
This function is known as an exponential growth function.
We know that the initial value is 30 and it is increasing at a rate of 13% per year. Therefore, using the above definition we get that,

