Can you pls answer the question? quick

1. A vassal is a person regarded as having a mutual obligation to a lord or monarch, in the context of the feudal system in medieval Europe

The lord took care of his vassal and provided for him.

2. In their master's land.

Serfs were slaves for their masters.

Explanation:

I am not sure about the last one, also sorry that this question was not answered sooner. I hope this helps.

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.