Answer:
7 hours
Step-by-step explanation:
9 : 30 to 17:00 = 7 hours 30 minutes
Minus 30 minutes = 7 hours
Answer:
The answer is the option 
Step-by-step explanation:
see the attached figure with letters to better understand the problem
we know that

-----> by vertical angles
-----> given problem
-----> given problem
substitute

I got this picture from photomath, hope it helps
That is impossible to answer because this is an expression. you can only solve for x in equations