Answer:69/5
Step-by-step explanation:
Good luck with that, that will be hard what type of stupid teacher gives that fro real.

Hope you could get an idea from here.
Doubt clarification - use comment section.
Answer:
15
Step-by-step explanation:
z2 - 2z + 15
(15)2 - 2(15) + 15
30 - 30 + 15
0 + 15
15