Hey there!! 
How do we find the midpoint? 
We take the average , the average is = 
Sum of the observations / total number of observations 
The end points are given as 4 and 11 
Sum = 11 + 4 
Number of observations = 2 
= 15 / 2 
= 7.5 is the midpoint 
 
        
                    
             
        
        
        
Answer:
-6x+9
Step-by-step explanation:
 
        
             
        
        
        
Answer:
x = 6
Step-by-step explanation:
Line M and line V are parallel so,
Given angles must be alternate angles and alternate angles has equal measurement
so we write an equation to find the value of x:
19x - 4 = 110 add 4 to both sides
19x = 114 divide both sides by 19
x = 6
 
        
             
        
        
        
Answer:
The sampling method applied is Cluster sampling. 
Step-by-step explanation:
A cluster sampling method is the type of sampling where first the entire population is divided into homogeneous groups. Then a random sample of these groups are selected.
After selecting a sample of groups, a random sample of fixed size is selected from each group.
In this case all freshmen are first divided into 30 sections, then 4 random sections are selected and the students in those 4 sections are sampled.
The sampling method applied is Cluster sampling.