Given:
Either has a school certificate or diploma or even both = 20 people
Having school certificates = 14
Having diplomas = 11
To find:
The number of people who have a school certificate only.
Solution:
Let A be the set of people who have school certificates and B be the set of people who have diplomas.
According to the given information, we have



We know that,



Subtract both sides by 25.



We need to find the number of people who have a school certificate only, i.e.  .
.



Therefore, 9 people have a school certificate only.
 
        
             
        
        
        
Answer:8.300
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
The solutions of the system of equations are the points
  
  
  
  
Step-by-step explanation:
we have
 ----> equation A
 ----> equation A
 ----> equation B
 ----> equation B
Solve the system by substitution
substitute equation B in equation A

solve for x


The formula to solve a quadratic equation of the form 
 
 
is equal to
 
in this problem we have

so
 
substitute in the formula
 
 
 ----->
  ----->  
  
 ----->
  ----->  
  
<em>Find the values of y</em>
For  
  
 
 
 ---->
  ----> 
   
For  
  
 
 
 ---->
  ----> 
  
therefore
The solutions of the system of equations are the points
  
  
  
  
 
        
             
        
        
        
The average speed can be obtained by the formula:

If a boat travels 36 miles in 1.5 hours ans then in 14 miles in 0.75 hour, then find:
- total distance is 36+14=50 miles;
- total time: 1.5+0.75=2.25 hours.
Therefore,
 miles per hour.
 miles per hour.
Answer:  miles per hour.
 miles per hour.
 
        
                    
             
        
        
        
Lets go step by step and factor out each as we go
first lets factor out a 3 since 3 is common in 9 and 3 
3(3ab^2 - abc) 
now lets factor out a since its common in both 
3a(3b^2 - bc) 
now lets factor out a b since its common in both 
3ab(b - c) 
we can't factor anything else out so we are done.