How did nationalism, colonialism & imperialism, and the Cold War influence the contemporary map of the 20th century?

Pythagorean theorem what is the value of x? x = 2 sides are 8 and 10

What characteristic of the basin that feeds the congo river system affects movement in central africa? a. the center of the basin is a dense rain forest. b. it is the center of ethnic conflict in the area. c. wildlife on the savanna makes it too dangerous to travel. d. the basin is surrounded by desert.

Plants in the arctic tundra must be able to live a) in wide range of temperatures b) without sunlight for the most of winterc) without waterd) at high elevations