Which procedure can be used to solve the equation 540=12z, and what is the solution?

540 = 12z

the process that would be used most often would be division.

540 = 12zdivide both sides by 12
540/12 = z
45 = z <==

although, another procedure could also be usedmultiplication..
540 = 12z...multiply both sides  by 1/12
540(1/12) = z
540 /12 = z
45 = z <==

The american colonies would have been ruled by a king.