17. Number of hours, h 10 + 2h Total Cost
1 10 + 2 x 1 12
2 10 + 2 x 2 14
3 10 + 2 x 3 16
4 10 + 2 x 4 18
This is true because as shown in the first example, you have to sub in the number of hours into the "h" value, and multiply it times two. After that, you add ten.