Help pls, due in soon, will give brainliest if correct

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.

Evaluate-27 ^4/3/8 a) - 81/16 b) 81/16 c) 16/81

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.