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.

During which time interval did the temperature in the kiln show the smallest average
rate of change?

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 f class=