Please, share just ONE problem at a time.  Thanks.
<span>Solve 2x^2-12x+20=0:
Simplify this by dividing each term by 2:  x^2 - 6x + 10 = 0
Identify a, b and c:  a=1, b=-6 and c=10.  Then b^2=36.
Write out the solutions using the quadratic formula:
        6 plus or minus sqrt(36-40)
x = ---------------------------------------
                            2
sqrt(36-40) = sqrt(-4) = plus or minus i2
Then:
 
         6 plus or minus i2
x = --------------------------- (answer)
                  2</span>
        
             
        
        
        
Answer:
Step-by-step explanation:

Combine like terms. 1/4 and 7/8 are like terms and LCD of 4 and 8 is 8
9/10y and -3/5y are like terms and LCD of 10 , 5 is 10

 
        
                    
             
        
        
        
Note: You missed to add the dot plots chart. As I found the chart after a little research. Thus, I am attaching it and based on that dot plot chart I am solving the question which anyways would clear you concept.
Answer:
'There are about 2 more students in each class at Oak Middle School than at Poplar Middle School' is the correct statement.
Step-by-step explanation:
From the diagram, it is clear that
The data set containing Poplar Middle School:
20   20   20   21   21   21   21   21   22   22   22   22   22   22   22   23   23   23   23   24   
The mean of a data set is the sum of the terms divided by the total number of terms. Using math notation we have:

   
    
The data set containing Oak Middle School:
20   21   21   22   22   23   23   23   23   24   24   24   25   25   26   26   27   27   28   29   
The mean of a data set is the sum of the terms divided by the total number of terms. Using math notation we have:

    
So, the difference in mean will be:
                                             
Therefore, 'there are about 2 more students in each class at Oak Middle School than at Poplar Middle School' is the correct statement.
 
        
             
        
        
        
Answer:
4.5=4 and 1/2
Step-by-step explanation:
 
        
             
        
        
        
Answer:
what
Step-by-step explanation: