Please explain how you got the answer thank you

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 sum of these mixed numbers 4 2/3+ 3 1/9

Two consecutive negative integers have a product of 30. what are the integers?