how do I find the length of AB?

Answer:
6.
Step-by-step explanation:
It is the only one that fits the equation 3x-1 reasonably
Answer: 17
Step-by-step explanation:
Multiply AB by two and equal it to 34
2(3x-1)=34
6x-2=34
Add two to both sides
6x=36
Divide by 6 on both sides
x=6
Now apply your 6 value into the AB length
3 times 6 minus 1
3x6-1