Describe the feudal system of middle ages europe. was is mutually beneficial to both the wealthy and the poor? explain your answer.

Simple astronomical telescope the objective lens has a focal length of 75 cm and that of a piece of 5cm of the lenses are 18 cm apart when will be final image of a distant object before

Irelanda. populationb. square mileagec. average population density per square mile

Quais são as consequencias (positivas e negativas) da extração dos minerais metálicos