Answer:
10c=h
Step-by-step explanation:
The graph showed 2h=20c
so h=10c
Slope of a line parallel is equal to change in y over change in x: which is 9/8, or 1.125. A line perpendicular is the negative reciprocal, which is -8/9.
I also agree with answer C
1/2 of a gallon if the pool will be gone each hour