Help can’t find the right answer pls 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.

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

The distance between two cities is 368 miles. if the scale on the map is 1/4 inch=23 miles, what is the distance between the cities on the map?