I need so much help

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.

Issof claims that the scale factor is 1/2. which statement about his claim is correct

The table shows the balance of a money market account over time. write a function that represents the balance y(in dollars) after t years.