Answer:
c
Step-by-step explanation:
I don't trust myself so I am sorry if it is wrong
Answer:

Step-by-step explanation:
Given


See attachment
Required
Find 
First, calculate 
--- angle on a straight line
So, we have:

Collect like terms


Next, calculate PQR

So, we have:

Collect like terms


So, PRO is calculated as:
--- angles in a triangle
So, we have:


Collect like terms


Answer: -4 is the answer
Step-by-step explanation: