The service tip for the waiter is 20%. the total cost of a meal is calculated as c + 0.20c. how much would you have to pay if you have a meal that costs $21.00?

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?

Bring the fraction a/a-4 to a denominator of 16-a^2

What is perpendicular to y=-1/2x+11