Answer:
well I guess 8(3+7) or 7(8+3)
 
        
             
        
        
        
 In calculating the mean of this data set  Ashrita did the best job.
 
The  Mean of the data set is the most commonly used measures of central tendency. 
It means the average value of the data set.
 one doesn't have to arrange the data in order  for finding it.
<h3>What is the meaning of mean?</h3>
The data set value  takes is to add them all together and divide that by the number of the data.
It can be written as

Where  are the values in the data set
are the values in the data set
Therefore we can conclude that Ashrita did the best job in calculating the mean of this data set.
To learn more about the mean visit:
brainly.com/question/968894
 
        
             
        
        
        
Consider, 

. Let's say 

 then the problem reduces to 

. (Do you understand this step?)
So then replacing a again with our definition we get, 

.
 
        
        
        
Answer:
   $0.90
Step-by-step explanation:
A 10-minute call exceeds the 3-minute initial period by 7 minutes. The initial period charge is 37¢. The additional minute charge is 7·9¢ = 63¢. Then the regular charge for that call is ...
   37¢ +63¢ = 100¢ = $1.00
The 10% discount reduces the charge by ...
   10% × $1.00 = $0.10
so the final cost of the 10-minute call is ...
   $1.00 -0.10 = $0.90 . . . . . cost of the call
 
        
                    
             
        
        
        
Answer:
1) incorrect 
2) incorrect 
Step-by-step explanation:
-2x-2x = 0 ?
-2x -2x = -4x
It will be 0 only if x = 0.
Not always true, so incorrect 
x+x = x² ?
2x = x²
They will be equal if x = 0 or 2.
Not always true so incorrect