Construct a trend projection equation that describes the changes in the student's GPA over time using the table below.
| Period |
Year |
Semester |
GPA |
| 1 |
Freshman |
Fall |
2.2 |
| 2 |
Freshman |
Winter |
2.7 |
| 3 |
Freshman |
Spring |
2.4 |
| 4 |
Sophomore |
Fall |
2.5 |
| 5 |
Sophomore |
Winter |
3.1 |
| 6 |
Sophomore |
Spring |
2.7 |
| 7 |
Junior |
Fall |
2.8 |
| 8 |
Junior |
Winter |
3.6 |
| 9 |
Junior |
Spring |
3.2
|