Hello! Can you help me with this problem?
|x−4| if x>4

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.

What is the equation of a line passing through the point (6,1) and parallel to the line whose equation 3x=2y+4

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15