Which area in latin america is actually a commonwealth of the united states?

a.) cuba
b.) puerto rico
c.) mexico
d.) panama

Cuba and Puerto Rico were both spanish colonies. Puerto Rico is however was accepted as part of U.S. as a common wealth .Cuba is  embargoed. Panama has canals that help ships get from Atlantic to Pacific and vice versa quicker. Mexico is an entirely different and independent country.

5×^2+20-15 or -(5x^2-20+15)