area of a triangle = 1/2 base x height
56.4 = 1/2 x 12 x height
56.4 = 6 x height
height = 56.4 /6 = 9.4cm 
 
        
             
        
        
        
Answer:
 (x) =
(x) = 
Step-by-step explanation:
Let y = f(x) and rearrange making x the subject
y = 4x ( divide both sides by 4 )
x = 
Change y back into terms of x
 (x) =
 (x) = 
 
        
             
        
        
        
Answer:
the width is 2 meters
Step-by-step explanation:
10 / 5 = 2
 
        
             
        
        
        
Answer:
what is the question?where ?