List all the prime numbers beteen 1-20

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.

A(t)=728(1+0.04)^t how much money did aditya originally invest

Evaluate the expression. (9 + 5)(3 + 2)0