Respuesta :

ahonyek
you have to use the prime factorization
A, 6= 2*3   15=3*5
You can see that three is common in both so you do not need both
LCM=2*3*5=30

B, 4=2*2    11 is a prime so 
LCM=4*11=44

Hope this will help you solve C and D too.