Answer:
4.4
Step-by-step explanation:
The mean is the sum of the data divided by the number of data values.  so add them all together and then divide by how many numbers you added together. 
Here is an example 1,3,4,5,7 so add 1+3+4+5+7=20 then you divide 20 by 5 and the mean is 4 for this example.
 
        
                    
             
        
        
        
Answer:
50.4 km (Answer B)
Step-by-step explanation:
From this information, we are able to create a proportion, 2cm/21km= 4.8cm/x km (x representing the actual distance). After cross-multiplying and simplifying, you get an answer of 50.4km. Hope this helps!
 
        
                    
             
        
        
        
Answer:
312 
Step-by-step explanation:
its easy
 
        
             
        
        
        
Answer:
The diameter would be 11 feet
Step-by-step explanation:
C = pi * d 
we don't know D so we rearrange the equation to solve for D by dividing both sides by pi:
C/pi = d 
Now we plug in everything
11pi/pi = d
The pi cancel each other out leaving with 11 feet
Therefore D = 11 feet