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Exploring Other Function Models

Apply the Model

Let’s revisit the original situation:

Khalid works on the weekends for his uncle’s gas company.  He has been analyzing the average cost the company has charged residents for natural gas over the past six months.

Month

Price (in dollars) per 1000 cubic feet

0

16.09

1

14.40

2

12.26

3

10.29

4

9.13

5

9.41

6

11.78

You have determined that the best fit equation isy equals 106 thousandths x cubed plus 548 x squared plus negative 1 and 243 x plus 16 and 89 thousandths.  The residuals were close to 0 and random, and the curve fit almost perfectly through the data points. Now that you have a model of best fit, you can use the model to make predictions about future trends.  Use your model to answer the following:


Check Your Understanding


Check Your Understanding

 

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