4. [5 points each] The number of attendees at a concert decreases exponentially after the event ends: N(t)=No [i] 11 The concert ended at midnight, and one hour later there were still 2244 attendees. a) How many people attended the concert? b) What time was it when exactly half the attendees had left? Round the time to the nearest minute. c) How fast is the number of attendees changing at 2:00 AM? Round your answer to the nearest person per hour. d) How fast is the number of attendees changing when there are 100 attendees remaining? Round your answer to the nearest person per hour