Answer:
To answer this question, you need to makes the unit of the smartphone screen same. In this case, phone A is using decimal and phone B is using a fraction. You can use which was easier. 
Let's try to use decimal. Then you need to convert phone B fraction width into decimal width. The calculation would be: 5cm + 1/3cm= 5 cm + 0.333cm= 5.333cm
From here it clear that phone B has a wider screen than phone A.
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:R
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Step-by-step explanation:
5(x-3y)+2(4x+y)-(x+y)
5x-15y+8x+2y-x-y
5x+8x-x-15y+2y-y
13x-x-13y-y
12x-12y
 
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
Use Pythagorean theorem since you have a right triangle  =
 = 
225 = 100 +  so x =
 so x = 