20:) because if you round 19 the nine makes the 1 a 2 lol
        
                    
             
        
        
        
Given:
The expression is:

To find:
The terms and like terms in the expression.
Solution:
Terms: Variables, constants and product of variable and constants are known as terms which are separated by addition sign "+".
Like terms: The terms which contain same variables with same power are known as like terms.
The given expression is:

It can be rewritten as:

Terms are  .
.
Like terms are  and
 and  and
 and  .
.
 
        
             
        
        
        
Answer:
in school a , 67.3 % of leaving students go to university.
in school b ,90.7% of leaving students go to university
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer: 26.8 feet
Step-by-step explanation:
 In the figure attached you can see two right triangles  triangle ABD and a triangle ACD. 
 You are located at point B and the other person at point C.
 The approximate height of the lifeguard station is <em>x</em>.
 
 Keep on mind that:
 
 Therefore:
 <em>For the triangle ABD</em>:
  [EQUATION 1]
    [EQUATION 1]
 <em>For the triangle ACD:</em>
  [EQUATION 2]
    [EQUATION 2]
 Solve from DC from [EQUATION 2]:
 
 Substitute into [EQUATION 1] and solve for x:
 
  ≈26.8ft
≈26.8ft