Answer:
z = 6
Explanation:
given that the triangles are congruent, then corresponding sides are congruent
FG and ST are corresponding sides, that is
FG = ST ( substitute values )
3z - 8 = z + 4 ( subtract z from both sides )
2z - 8 = 4 ( add 8 to both sides )
2z = 12 ( divide both sides by 2 )
z = 6