The theory of states' rights was used to justify -- O the Underground Railroad
O declaration of war
O abolitionism
the system of slavery

D

Explanation:

Tell me if its wrong-

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 is x. lo xd