It would be -4x+(-12)=12 good luck
        
                    
             
        
        
        
Answer:
y=x216–6x16+4116
Step-by-step explanation:
plato :)
 
        
             
        
        
        
Solution:
Let me define pyramid first.A pyramid is a Polyhedron , whose base  can be any polygon and it's faces are triangular which meet at a point called vertex.
Volume of Pyramid =  
Side of base which is an equilateral triangle= 4 cm
Area of whole pyramid = 12 square cm
Area of Equilateral triangle having side 4 cm= cm²
 cm²
So, Area of three triangle which are faces of pyramid = (12 - 4 √3)cm²
Area of triangle = 
12 - 4 √3= 
Height = 
 
Height=(6-2√3) cm
Volume of pyramid = Area of Equilateral triangle which is it's Base × Height of Pyramid
           =4√3 × (6-2√3) cm³
            =(24 √3 -24) 
            = 24 (1.732-1)
           =24 × 0.732
           =17.568 cm³