Which letter would be the most meaningful variable for this problem situation? The weight of a box increased by 5

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?

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line