Lauren is saving money for a new sweater. Every Sunday she counts and records the number of dollars in her piggy bank and notices that these amounts resemble a function, f(x) , where x is the number of weeks since she started saving and f(x) is the amount of money in the piggy bank at the end of that week. The table of values for the function, f(x) , is given below.
| x | f(x) |
|-----|------|
| 0 | 0 |
| 1 | 5 |
| 2 | 10 |
| 3 | 15 |
| 4 | 20 |
| 5 | 25 |
| 6 | 30 |
| 7 | 35 |
| 8 | 40 |
| 9 | 45 |
| 10 | 50 |