Each table in the accompanying LineFit data contains a set of data that describes a functional relationship between the dependent variable y and the independent variable x. Construct a scatter chart of each data set and use the Trendline tool in Excel to determine the?best-fitting functions to model these data sets. Do not consider polynomials beyond the third degree.

First data set:

x y

1 -105.6

1.5 -38.2

2 -6.2

2.5 -16.0

3 -6.7

3.5 -5.1

4 -3.0

4.5 -0.5

5 0.0

5.5 0.4

6 0.6

6.5 4.1

7 8.1

7.5 9.1

8 24.5

8.5 55.7

9 105.1

9.5 144.0

10 27.8

10.5 197.7

Second data set:

x y

10 16.43

10.5 13.02

11 13.02

11.5 11.67

12 12.86

12.5 11.84

13 10.88

13.5 10.93

14 11.22

14.5 10.88

15 11.25

15.5 11.12

16 11.42

16.5 10.77

17 10.95

17.5 9.77

18 7.92

18.5 9.46

19 7.50

19.5 7.62

20 6.12

Third data set:

x y

1 3.45

2 4.39

3 6.22

4 7.58

5 9.62

6 8.25

7 6.96

8 11.20

9 12.74

10 16.26

11 15.12

12 29.33

13 35.78

14 44.23

15 34.53

16 62.13

17 54.54

18 62.02

19 110.62

\f\fChart c Ay 250- + 200- 150- 100- 50- X 0- 8 12 -50- -100- -150-\f