Arainshadow desert forms a rainshadow desert forms in places where mountain ranges act as barriers to the movement of water vapor in cold, polar regions near the equator, where moist air rises (because it is hot and less dense) up, away from earth's surface when dry air descends from high in the atmosphere between 20° and 30° latitude

The answer is a rainshadow desert forms in places wherein mountain ranges acts as barriers to the movement of water vapor. A rain shadow is a patch of land or part of land, mostly seen in mountain ranges, because it has been forced to look like a desert, because the mountain range blocks plants growing and rainfall as well. One side of the mountain, precipitation is absorbed, so as snow, while the other side of the mountain or the desert side, blocks the precipitation.

Answeris associated with sunny,dry weather;

5×^2+20-15 or -(5x^2-20+15)