3 Mr. Eliot needs to drain his above ground pool before the winter. The graph below represents the relationship between the number of gallons of water remaining in the pool and the number of hours that
the pool has drained.
Pool Water Level
10010
M40
7200
Water (in gallons)
1900
200
s
Time in hours)
a. Write a function that models the situation above.
b. What is the rate of change? What does it represent in the context of the problem?
c. What is the x-intercept? What does it represent in the context of the problem?
d. What is the y-intercept? What does it represent in the context of the problem?
e Over which interval, if any, is the function positive? What does it represent in the context of the
problem?
f. Over which interval, if any, is the function negative? What does it represent in the context of the
problem?