Answer:
B. 6
Step-by-step explanation:
There is a lot more information needed to be able to solve this problem that is not shown. If A is the midpoint of segment XY, and B is the midpoint of segment YZ, then we can solve the problem.
I will make those assumptions now.
2(AB) = XZ
2(3x - 1) = 34
3x - 1 = 17
3x = 18
x = 6
Answer: B. 6
