Three students wrote equations on their dry erase boards. Which of these students wrote an equation that is true?

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.

Gretchen is setting up for a banquet. she has 300 chairs and needs to distribute them evenly among t tables. how many chairs should she put at each table? write your answer as an expression.

What is the circumference of a circle with an area of 50.24 cm²?