Answer:
R=-33
Step-by-step explanation:
 
        
             
        
        
        
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Answer:
135°
Step-by-step explanation:
π : 180
3π/4 : 180 × 3/4 = 135 
 
        
             
        
        
        
3 [ (20-4) / 2 ]= 3 * 16/2=  3 x 8 =24
5,(9)=5 9/9= 54/9=6
6/8/4= 6/2=3