If CDE is a straight angle, DE bisects GDH, GDE = (8x - 1)", EDH = (6x + 15), and CDF = 43°, find each measurement

There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?

See attachment below and find the equivalent of tan(∠qsr)