Steps for solving superposition problems?

Select any 1 source and short all other voltage sources and open all of the current sources if the internal impendence is not known. If  known replace them by their impendence. Sorry this is the best i got

you dont brother god luck

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.