Determine what color is the rock layer that is the oldest

Well I'm not sure about the color but for sedimentary rock the bottom rock is the oldest

answer: this problem has only trivial solutions, with all points on the same line. x=5 or x=7/5.

step-by-step explanation:

there are three triangles, and three unknowns: x, y=length of middle segment, and z=cos(angles marked with red arc).

we need

and law of cosines,

the three equations are

see attached image for solution.

answer; i believe that the correct answer is (chronological order);