1. The graph below shows how the water level of a swimming pool changes as the pool is filled with water. What does the slope of the graph represent?
Y
7
Depth of Water in
Swimming Pool (in feet)
N
0
1 2 3 4 5 6 7
Time (in hours)
A. the time it takes to fill the pool completely
B. the maximum depth of the water in the pool
C. the rate at which the pool fills in feet per hour
D. the rate at which the pool fills in hours per foot