Which of the following when added to 4x²+ 9 will result in a perfect square for all integer values of a?

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?

If 25% of y is 30, what is 60% of y?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?