What is the vertex of this parabola y=-5x^2-10x-13

Simplify the expression. -2/5(10+15m-20n)

Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14