Three-fourths of the difference of a number and 7 is negative fifteen. What is the number? (Please solve very clear and step by step and I'll give u brainlest)

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.

Tcan be concluded that % of the seniors would prefer to see more candid pictures in this year's edition of the yearbook.

8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?