Find the equation for the parabola that has its vertex at the origin and has directrix at x =1/34

Solve the system of equations. y= 2x y= x^2 - 15

Can someone me out here and the tell me the greatest common factor

Kayla and alberto are selling fruit for a school fundraiser. customers can buy small boxes of grapefruit and large boxes of grapefruit. kayla sold 3 small boxes of grapefruit and 1 large box of grapefruit for a total of $65. alberto sold 1 small box of grapefruit and 1 large box of grapefruit for a total of $55. what is the cost each of one small box of grapefruit and one large box of grapefruit?