Answer:
the formula for surface area is 2(lb + bh + lh) sq  is that helps :))
Step-by-step explanation:
 
        
                    
             
        
        
        
Ok... so this question can be solved by using simultaneous equations. 
Use the general from of a parabola 

you know the value of c, the y-intercept... y = -4
which means the equation is 

now use the other 2 points to get 2 equations in 2 unknowns
(-2, -20) just substitute 

this becomes

now the other equation using (4, -20)
The simplified form is 
 
        
        
        
Answer:
Neither arithmetic nor geometric.
Step-by-step explanation:
 
        
                    
             
        
        
        
It would need to be 16.4592 meters higher which rounds to 16 meters rounded to the nearest tenth
        
             
        
        
        
<u>answer:</u>  
<u>work:</u>
 | subtract 13.50 and move it over
  | subtract 13.50 and move it over
 | divide by 7/2
  | divide by 7/2
 | final answer
  | final answer