To this point in the lesson, you have learned how to determine the best polynomial regression function to model a set of data. The remainder of this lesson focuses on using the polynomial regression to solve problems.

Graph the data using Steps 1 to 7 as shown in Examples 1 to 4. Place Graph the regression model using Steps 8 to 11 as shown in Examples 1 to 4. - To find the possible distance travelled in 45 minutes means to find
*y*when*x*= 45, and this is accomplished in the following steps.
The distance travelled in 45 minutes is approximately 34.27 kilometres. - To find the time Nicola took to travel 25 kilometres means to find
*x*when*y*= 25. Although several ways to find this answer are possible, the most accurate method is shown in the steps that follow.
Nicola takes approximately 32.65 minutes to drive 25 kilometres. |