What is the x-coordinate of the vertex of the parabola whose equation is y = 3x2 + 9x?

How do you find the area of a triangle

The ksp expression for the system pbcl2(s) pb+2(aq) + 2 cl-(aq) is: [pbc12][pb+2][2cl-] [pb+2][cl-]2 [pb+2][2cl-]2 [pbcl2][pb+2][cl-]2 [pb+2][2cl-]2[pbcl2]

Triangle knm is what is true about the sides of knm