What round 3\7 to is closest

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?

V=x^4-y^4 pick three expressions that can represent the three dimensions of the prism (each in meters)

Which expression represents the total perimeter of her sandwich, and if x = 1.2, what is the approximate length of the crust?