The graph for Pool A shows the gallons of water filling the pool as a function of time. The graph for Pool B shows the rate filling the pool as a function of time.

Part A: Describe the rate of filling for each pool from 0 to t1.
#1 Part A: Pool A fills at a rate that is
a. increasing
b. decreasing
c. 0
d. constant but 0
#2 Part A: Pool B fills at a rate that is
a. increasing
b. decreasing
c. 0
d. constant but 0

Part B: Describe the rate of filling for each pool from t1 to t2.
#3 Part B: Pool A fills at a rate that is
a. increasing
b. decreasing
c. 0
d. constant but 0
#4 Part B: Pool B fills at a rate that is
a. increasing
b. decreasing
c. 0
d. constant but 0