What is the area?? Plz I need help and there are still 18 questions left

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?

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

According to the data set, where should the upper quartile line of the box plot be placed?