Afurniture store is having a sale on couches . if a couch that originally costs $3400 is on sale for 15% off. what is the actual cost of the couch?

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.

Antonia and carla have an equivalant percentage of green marbles in their bags of marbles. antonia has 4 green marbles and 16 total matbles. if carla has 10 green marbles , how many total marbles does carla have

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?