Answer:
The graph showing the temperature change over time is missing.
Step-by-step explanation: The slope of the line in the graph is the rate of temperature change per minute.
1. Calculate the slope between for each of the 3 ranges listed. Slope is rise/run: Take two points at the upper and lower boundaries of each range. You should have three sets of points:
e.g., (0,100) and (340, 175); (345, 176) and (360, 180); finally (360,185) and (380, 200). I made these up, since there is no graph. but the x values, the time in minutes, correspond to the ranges requested.
If the slopes are diferent, then explain that the rate of temperature rise is different for each segment.
3. Time is 360 + 60 = 420, temperature is 80: (420,80)