Place the steps for finding f -1(x) in the correct order. f(x)=4x+7

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]

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

What is the absolute value of the complex number -4-sqrt2i