Ms clark has 10 boxes of markers. each box contains 9 markers how many markers does ms clark have in total

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.

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Find the value of x. give reasons to justify your solutions! l, m ∈ kn