One busy Chaperone pours herself some coffee into a paper cup before making her way to the amusement park. The coffee temperature is 350C when the cup is placed on the kitchen counter with room temperature of 20o . The Chaperone is called to the phone for last minute arrangements, and her coffee is forgotten. When she finally returns to her coffee 35 minutes later, the temperature has been decreasing by 1.2% per minute.

a. What type of function best models the cooling of a hot liquid? Explain your choice