The first one is the correct answer because if the sign if somethings goes from negative to a positive or positive to a negative, everything in the equation switches.
Answer:
The answer would be the Prime Meridian
Explanation:
The prime meridian, or 0 degrees longitude , and the International Date Line, 180 degrees longitude , divide the Earth into the Eastern and Western hemispheres.
The <span>geographic region of Russia that was especially suitable for nomadic invaders is the </span><span>southern steppe because it is an open, treeless grassland</span>. Thus, there was no geographical border that prevented the invaders from marching to Russia with their military force. The Ural mountains, on the other hand, gave much protection to Russia against invaders as it prevented access to the region.
The name of the current Presidents eldest child is Donald Trump Jr.
