Solve pls brainliest

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.

Solve the system of equations. y= 2x y= x^2 - 15

Which conjunction is disjunction is equivalent to the given absolute value inequality? |x+2|< 18