When you enter an equation into the calculator, the calculator will begin by expanding (simplifying) the problem. Then it will attempt to solve the equation by using one or more of the following: addition, subtraction, division, taking the square root of each side, factoring, and completing the square.
Serfdom is a legal and economic system. A serf is a worker who has to stay in one area. Serfs were the lowest social class of the feudal society. Serfs were different from slaves. Serfs could have property. In most serfdoms, serfs were legally part of the land, and if the land was sold, they were sold with it. Serfdom is the forced labour of serfs, on the fields of the land owners. Serfs got protection and the right to work on the leased fields. Serfs worked in fields, and other agricultural-related works, like forestry, transportation (both land and river-based), work in craft and even in manufacturing.
Who were Serfs. Serfs-were usually farmers (but also could be craftsman) who did not own land. Serfs worked a noble's (their lord) land and gave their lord a percentage of what they produced (anywhere from 25% up to 50%) in return for their lord's protection against robbers, raiding vikings and other nobles.