Answer:
a) cluster sampling
Step-by-step explanation:
In cluster sampling method, each member of a population is assigned to one and only one group.This means clusters are formed through probability method usually a simple random sampling.The participants in the clusters are the only one to be surveyed.
In this example,  simple random sampling is used to identify 12 home rooms(cluster) where a group of 20 students (participants) in each room is given the survey.
 
        
             
        
        
        
Answer:
3 days will pass
Step-by-step explanation:
work 24×1/3=8
sleep 24×3/8=9
meals 24×1/8=3
computer 24×1/6=4
reach up to 24 with sleep
9+9+9=27
which took a little over 3 days
 
        
             
        
        
        
The answer is B.) one
Hope this helps :)
        
             
        
        
        
Side A’B’ and D’C’ are related because they are both parallel which I think means that they would be the same length