Succeeding, winning, being victorious, etc. Take your pick. It basically means to succeed.
The west-to-east winds that occur in the temperate zones of the http://www.answers.com/topic/earth.
Prevailing winds include the Trade winds (in the subtropics), Westerlies (in the mid-latitudes), and Polar Easterlies poleward of there. They are called prevailing winds because they tend to usually...
the prevailing westerlies blows from WEST to EAST, between 30 and 60 degrees latitude.
Yes, it is the direction from which the wind tends to blow.