Answer:
r=8
Step-by-step explanation:
Given formula:
r = C / 2π
It is given that C = 16π
hence
 r = 16π / 2π = 8
 
        
             
        
        
        
The answer is A because if you go from each point on Q  to R it is 7 units away
        
             
        
        
        
Step-by-step explanation:
Speakers =£ 31.5
Headphones =£ 4.8
Book =£ 3.85
Mobile phone =£ 36
mouse = £12.75
DVD =£ 10.2
Hope it will help you :)