Katherine takes a cup of water initially at 100 degrees Celsius from the stove and places it on a table to cool. The room temperature is 21 degrees Celsius. In 10 minutes, its determined the water temperature is 85 degrees Celsius. 3. Determine the exponential function that gives the water temperature in (degree Celsius) as a function of time in (minutes). (3 points) b. If the water was set on the table at 10:00 AM. What time will it be when the water temperature is 50 degrees Celsius ? ( 2 points)