How do you find the x-intercepts and the vertex of this parabola: y= -x²-5x ?

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?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?