Sixteen is seven plus three times a number

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.

Given ab and cb are tangents of p, and m =10°. what is the measure of abp?

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?