If pantry is 3 ft wide and the square ft is 9 what is the length

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.

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Iwill give you ! what is the measure of ∠v ?