Answer:
Lcm=18
Step-by-step explanation:
First do prime factorization of 6 and 9 
common factor of 6 is 3 
and remaining factor is 2×3
Now,
C.F×R.F= 3×2×3
=18 
 
        
             
        
        
        
For the first one it’s b and I’m sorry but I’m not sure about the second
        
             
        
        
        
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Cubic centimeters, because cubic is used for volume. Hope this helps! Happy Studying!