Use to unit multipliers to convert 7 ft.² to square inches

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.

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41

25) 56(1) = 5b a. identity property of addition b. identity property of multiplication c. commutative property of multiplication d. commutative property of addition