Radius is MN
Cord is TR
Hope this helps 
Only two questions came up
        
             
        
        
        
Answer:
-3+(-6) = -9
Step-by-step explanation:
a negative 3 plus another negative 6 is a negative 9. Is just like if you borrow $3 from your friend and borrow $9 from another friend. That means you own two of your friends a total of $9. This can be mathematically illustrate as: -3 + (-6)= -9
 
        
             
        
        
        
It's 8x + 16y/2 + 4x - 4y :))