Answer:
A) 
B) 
Step-by-step explanation:
A) You can add these expression because they contain the same square root:

B) Same as above:

 
        
                    
             
        
        
        
Answer:
Graph A passes THrough the Center making it proportional when graph B is not passing 
Step-by-step explanation:
 
        
                    
             
        
        
        
For this case we have that by definition, the standard form of the equation of the line is given by:

We have the following equation:

We manipulate the equation algebraically:

Finally, the equation is:

Answer:

 
        
             
        
        
        
Option B model shows the percent of beads that are blue.
Solution:
Fraction of beads blue = 
To convert it into percent multiply the fraction by 100.

                      
Cancel the common factors, we get
                     = 20%
                     
This means total number of boxes 100 and shaded in blue color 20.
Therefore option 2 represents  .
.
Hence option B model shows the percent of beads that are blue.