An exponential function is of the form y = ab^{x} where ** a** represents the initial amount,

**represents the common growth/decay factor, and**

*b***represents the time.**

*x*20 represents the initial amount or the number of rabbits when it was first counted, and 1.104

represents the common growth factor, ** b**.

When x = 50, the value of p(x) is y = 20(1.014)^{50} \approx 40

When x = 100, the value of p(x) is y= 20(1.014)^{100} \approx 80

The average rate can be calculated by the formula \frac{y_{2}-y_{1}}{x_{2}-x_{1}}

Plugging in (50, 40) as (x_{1}, y_{1}) and (100,80) as (x_{2},y_{2}) we get the average rate of change as \frac{80-40}{100-50} = \frac{40}{50} = 0.8.

I found an answer from www.nysedregents.org

**ALGEBRA** I

Jun 12, 2018 **...** Score **1**: The student wrote one correct explanation. 33 A **population of rabbits in** **a lab**, p(x), can be modeled by the **function** p(x) 20(1.014)x, ...

For more information, see **ALGEBRA** I