The Spanish conquest of the Inca Empire was one of the more important operations in the Spanish colonialism of the U.S. After times of introductory research and military conflicts, 180 Spanish fighters under conquistador Francisco Pizarro, his colleagues, and their local allies seized the Sapa Inca Atahualpa in the 1532 Conflict of Cajamarca. It was the beginning action in a long campaign that took decades of fighting but stopped in Spanish victory in 1572 and settlement of the area as the Viceroyalty of Peru.
I think it might be called the "tail." I might be getting this mixed up with a comet, but I THINK(emphasis on think ^^') they're similar in that aspect?? Sorry if this didn't help.
I think it's w - 7 = 89 because there is a key word in the question and that key word is withdraw. If you withdraw something then that means that it's subtraction. You don't know how much Carla's bank balance was before withdrawing so it's a variable (w). Therefore it's w - 7 = 89.