37 % of $2927 is what

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 is the rate of change of a line that passes through (2,-5) and (6,-2)?

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?