Parasitism could be considered a form of which of these types of relationships? mutualism commensalism predator-prey mimicry

Convert 16 yards to feet use the conversion rate 3 feet = 1 yard

Y=4x^2+x-1 solve using quadratic formula

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.