Let be the number of units (in thousands) that a company produces and let be the profit (in tens of thousands of dollars). The following table gives the profit for different levels of production.
2
4
6
8
10
12
14
16
18
20
-1.1
-1
4.6
17.7
42.7
77.3
136.7
211.7
294.3
378.5
Use the cubic regression program to find a mathematical model for .