At 5:00 pm Antonio turned on the oven. While the oven preheated, the temperature in the oven increased form 72F to 400F over a 10-minute period. The oven remained at 400F for 45 minutes until Antonio turned it off. It took 60 minutes for the temperature in the oven to cool, returning to 72F at 6:55 pm which statement best explains whether or not the temperature in the oven is a function of the time?