Questions

The logic in this puzzle is summing the result of [subtraction of upper two digits] & [addition of lower two digits] 

Hence, the result is  

(5 - 3) + (2 + 8) = 2 + 10 = 12.

Greek, demotic Egyptian and hieroglyphics.

Para-amino salicyclic acid (PAS) is used in the treatment of Tuberculosis.

The area in which two types of air masses meet is called Front. There are two types of fronts. They are 

1) Cold front

2) Warm front

When a cold air mass pushes a warm air mass, it is called as Cold front. Similarly, when a warm air mass pushes the cold air mass, it is called as warm front.

A deliverable is a measurable, verifiable work product such as a specification, feasibility study report, detailed design document, or working prototype.