How has the world become more economically interdependent?

Explanation:

Global economic interdependence has grown in the post-World War II period as a result of technological progress (e.g. computerization, containerization, low-cost travel, low-cost communications) and associated policies that were aimed at opening national economies internally and externally to global competition.

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b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.

reflecting point a across the origin negates both of its coordinates.

b = (5, -4)