The exponential decrease (decay) equation is given by:

Where P is the population at time t, Po is the initial population, and r is the decay rate in decimal form.
We are given the parameters: Po = 24000, r = 10% = 0.10.
Substituting:

We can use the equation to fill up the table. For example, for t = 1:

Proceeding in a similar way, we can find the rest of the values for t = 2 up to t = 10.
b) Expressing the rule in words, we can find the population in a given year as 0.9 times the population in the previous year, starting at 24000.
c) The recursive formula is:
