If x is a rational number and y=2/3 which statement describes the sum of x and y

And employee salary increased by $4500 which represents a 15% raise what is the rate of the increase

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 average rate of change for this function for the interval from x=2 to x=4 ?