To figure out R, add 1.97+0.65 together. 1.97+.065=2.62
        
             
        
        
        
first multiply the outside numbers by both the numbers in the ()
10xg=10g       10x5=50    2xg=2g             2x9=18
then combine like terms 
10g+50=2g+18
8g=32
then divide
g=4
 
        
             
        
        
        
Answer:.66
Step-by-step explanation:
You divide 8 and 12
 
        
                    
             
        
        
        
63x+45x   = 108x
You just multiply 3x by 21 and 15 to get 63x and 45x. You then add the like terms to get 108x.