A ticket window at a theater opened at 9:00 a.m. and closed at 5:00 p.m. At
the beginning of each hour, the number of people in line was recorded. The
graph shows the number of people in lines as a function of the time, where
t = 0 represents 9:00 a.m. and t = 8 represents 5:00 p.m.
45
Number of people in Line
40
35
30
25
20
10
0
7
3 4 5 6
Time hours from 9:00a.m.)
Based on the graph, how many hours after the ticket window opened did
the number of people in line reach a minimum before increasing?
a
A. 1
B. 3 A
C. 5
D. 8