how long is |MN| when you measure it and do you know anything about the length of |NO| and |OP|?
assuming |MN|= 7.7 ; |NO|= 4.7 ; |MO|= 5.5:
o²= m²+n²
= 4.7²+5.5²
=52.34
o=V52.34
≈7.23
 
        
             
        
        
        
I believe that x is equal to 6. x=6
 
        
             
        
        
        
suppose 4:4:7 be 4x, 4x, 7x
or, 15x = 180° 
or, X = 180/15
or, X = 12
therefore, 
4x = 4x12= 48
4x= 4x12= 48
7x= 7x12= 84
so if you plus all of them you get 180
 
        
             
        
        
        
Step-by-step explanation:
(b) If  then
 then
 
 
Note that  cancel out so we get
 cancel out so we get

Solving for  we get
 we get

(c) I'm not sure what the problem is asking for but here goes. As r doubles,  becomes
 becomes 

 
        
             
        
        
        
He is wrong...
2 1/2 + 3 3/5 = 97/20
Simplified, I believe the answer is 4 17/20