Aline parallel to a triangle's side splits ab into lengths of x - 7 and x - 3. the other side, ac, is split into lengths of x and x + 12. what is the length of ac?

Shown here are the three essential steps in a proof of the pythagorean theorem. comparing the 1st and 3rd steps how are the colored regions related as to the areas? a. yellow+blue=orange b. orange=yellow=green c.yellow+blue=green=orange d.yellow+green=orange+blue

Ihave like no idea how to do any of this !

:) i will answer any of your question +20 ponits