Is 3,540 reasonable for the difference 9,760-5,220

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

What rotation was applied to triangle def to create d’e’f’?

Find the distance between the pair of points a(-1,8) and b(-8,4)