Vector 

.  

.  So the sum is 

.
For the second, the magnitude is the square root of the sum of the squares of the components.  This is equal to 

.
 
        
        
        
Https://mathbitsnotebook.com/Algebra1/RealNumbers/RNProp.html
        
             
        
        
        
Answer: Circle: 4 Square: 18 Triangle: -5
Step-by-step explanation: Hope this helps! :)
 
        
                    
             
        
        
        
The coordinates would be (-3,-1)
        
                    
             
        
        
        
Answer:
Transitive property 
Step-by-step explanation:
I'm so sorry if it's wrong I took geo last year online and I still hated proofs. Transitive property is basically when x=y, y=z so x=z. since <4 and <5 are congruent and <1 and <4 are congruent, that would make <1 and <5 congruent because of the transitive property. Good luck with proofs!