Mexican flag
what does each color represent ? 3. when was the flag adopted and what is the story behind the eagle and the serpent? 4. were there earlier forms of the flag? why have the changes been made?

Green means Hope, white means purity, Red means union

and the story behind it  was The leader was told by the god that the tribe would come across an eagle, perched on a cactus, devouring a snake. and when they find that would mean that they found their home area

 and it was adopted in September 16, 1968

i don't know the rest sorry

It is letter b
los empleados se quejan de no tener un buen sueldo.

Ithink it is d but dont beleive i really dont you to get it wrong.
why dont you use a translator. just download the google translate app that allows you to gake a photo and then it translates everything for you.
well i hope that works and good