Firing a piece of pottery in a kiln takes place at different temperatures for different amounts of time. The graph below shows the temperatures in a kiln while firing a piece of
pottery after the kiln is preheated to 200°F.
1600
(8,1800)
(5,1640)
(2.5,1300)
1200
Temperature (°F)
800
(1.5.900)
(1.700)
400
2
4
6
8
10
N
Time (hours)
During which time interval did the temperature in the kiln show the greatest average rate
of change?
1) 0 to 1 hour
3) 2.5 hours to 5 hours
2) 1 hour to 1.5 hours
4) 5 hours to 8 hours