What is the value of the expression below when z=7 6z-2

The system of equations graphed below has how many solutions? y = 2x + 2

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]

What is not true about kl and mn? what is mn? (show your work)