Answer:
PZ = 6
Explanation:
Given WY + XZ = 28 and WP = 8, you know that WY is 2 times 8, which is 16.
Knowing that, you can subtract 16 from 28 to get 12 which is the length of XZ. PZ is half of XZ and therefore half of 12 which is 6.
Hope this helps!