The graph shows the temperature of a room, in degrees Fahrenheit, over time, in minutes. How long was the temperature decreasing? min The graph has degrees Fahrenheit on the y-axis and time in minutes on the x-axis. The graph has five sections.
 Section 1 is a line from point 0, 65 to point 20, 75.
 Section 2 is a line from point 20, 75 to point 40, 75.
 Section 3 is a line from point 40, 75 to point 50, 63.
 Section 4 is a line from point 50, 63 to point 70, 75.
 Section 5 is a line from point 70, 75 to point 80, 75.