Answer:
WX = 18
Step-by-step explanation:
This is just a simple 1:2 congruency.
We know that because side FD is equal to 7 and side XY is equal to 14.
7:14 is the same as 1:2.
Using that logic we can then apply it to side FE.
Multiply 9 by 2 and you'll get your answer of WX = 18.
