Acustomer pay 18 for a dvd that originally cost 20. what is the decrease in the cost of the dvd

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?

The perimeter of a stage is 116 feet. it is 17 feet wide. how long is it?

The multiplicative property of equality states that for real numbers a, b, c, and d, if a = b and c = d, then ac = bd. true false