10 + f = 10
-10 -10
f = 10 - 10
f = 0.
The answer is 1.9 gallons
#1

- The limit tends to 0
- Hence c=0

- Here limit tends to 1
- Hence c=1

- Here x tends to infty.
- c=infty
For the fourth one limit also tends to zero
Peter's meal costed $8.11 in total. Hope this helps :D