2.  One way radical functions are used in the real world can be seen in an equation, relating the number of Earth days in a planet’s year to the average distance between the planet and the sun.

3.  This equation uses metric units and is given by the following formula.

4.  Here, D represents the number of Earth days, and x represents the average distance between a planet and the sun, in millions of kilometers.

5.  As an astronomer, being able to graph this radical function can help your understanding of how the planets in the solar system behave.

6.  We can use radical equations to model the growth of a certain population of creatures.

7.  An equation for population growth can be given by the following equation.

8.  Here, P represents the number of creatures in the population, and x represents the time, in years, after a specific period in time.

9.  The 20 helps determine the growth of the population and the 50 represents the initial size of the population.

10.  As a biologist, you may be interested in graphing this equation to predict the size of a population at some later time.