Total change in temperature for the time period of 27 minutes = 27 * 3 = 81 degrees
We are told that;
Temperature rises by 3 degrees every minute.
Now, we are looking at a time from 6:45pm to 7:12pm. The total time here in minutes is 27 minutes.
Thus;
Total change in temperature for the time period of 27 minutes = 27 * 3 = 81 degrees
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