What is 1+1, please help :(

Which one from below is not one of the reasons of planning failures? (clo3) a)-planner is careless. b-planner spend less time in the field but more time on the desk c)-planner is not qualified d)-planner does not have sufficient time to properly plan

Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above

What is the heat treatment of metals? what is the benefit of it? why and how it's useful? answer in details, do not write by hand.