What is the length of the sides of a square with an area of 784sqft

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.

Average acceleration: i have no idea how to do this.

What are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)