What value must k take in order for the following expression to be greater than zero? 3/k - 5/7

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

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

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2