I need help with this I am trying to help my grandson please and thank

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.

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.

Which expression is equal to (f+g)(x)?