Jim opens a computer store and decides to track his store’s progress as time goes on. He makes a table of values with one variable being time in weeks and the other variable being the amount of money the store makes in thousands of dollars. Find a polynomial function that models Jim’s sales.

Time (x) |
1 |
2 |
3 |
4 |
5 |
6 |
7 |

Revenue (y) |
4.2 |
17.4 |
46.6 |
97.8 |
177 |
290.2 |
443.4 |

^{3}+2n^{2}+1/5 n+2

^{3}+2n^{2}+1/5 n+1

^{3}+2n^{2}+1/3 n+1

^{3}+n^{2}+1/5 n+1