Answer:
it depends on the type of line but for a straight line the starting point is always the edge that is A
 
        
                    
             
        
        
        
Answer:
Side of square bottom=6.46 m
Height of box=4.31 m
Step-by-step explanation:
Let s be the side bottom
Height of box=h
Volume of box=
Volume of box=


Cost of bottom=$40 per square  m
Cost of sides =$30 per square  m
Total cost=


Differentiate w.r.t s






Again,differentiate w.r.t s

Substitute s=6.46

Hence, the cost is minimum at s=6.46

Side of square bottom=6.46 m
Height of box=4.31 m
 
        
             
        
        
        
split the right triangle from the trapezoid and solve for that right triangle first
 
        
             
        
        
        
Step-by-step explanation:
2+X = 8
X = 8-2
X = 6
hence, the value of X is 6
hope it helpful