You and your brother are pushing a car with a dead battery with forces of 20 N and 25 N in the same
direction. What is the resultant force applied on the
car?​

45 N

Explanation:

Add the forces together if they are going in the same directions.

20 N+25 N=45 N

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.