Answer:
There is $40 saved at the end of the sixth week.
For every week after week zero, you gain an additional five dollars added on to the ten dollars you have saved. So, the table in the question should look something like this:
x (weeks) y (money saved)
0 $10
1 $15
2 $20
3 $25
4 $30
5 $35
6 $40