F(x) = sqrt{x} - 6 for x = -7, a + 9

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?

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

With both problems. a.s.a.p directions on photo ^