Given that the minute hand is at exactly 12hrs there is a difference of 5 hours in between so you multiply 5over 12 by 360degrees and you get 180degrees 
5/12*360=150
 
        
             
        
        
        
For one since since the angles should add up to 180 degrees we must start by adding 55 and 25 which is 80 so 180-80=100 which means c is 100 degrees and for the other I'm going with C
        
             
        
        
        
You're welcome you didn't take the full question
 
        
        
        
<h3>hello!</h3>
In order to solve this equation, we need to take the square root of both sides (in order to get rid of the square and isolate x, because we are asked to determine the value(s) of x)
x²=36
√x²=√36
x=6
Is this the only solution? 
<em>A negative times a negative is a </em><em>positive...</em>
-6 is another solution of this equation! :)
Hence, the answers are:-

<h3>note:-</h3>
Hope everything is clear; if you need any explanation/clarification, kindly let me know, and I will comment and/or edit my answer :)