What rectangles?
attach a link or pic
        
             
        
        
        
Answer:
It has a maximum
Step-by-step explanation:
The way I think about it is looking at "a" (the leading variable's coefficient, so __x²), if it's negative, the graph is a frown, but if it's positive, it's a smile. In this case, a is -2, so the graph would have the shape of a frown, which has a maximum. 
I hope this helped!
 
        
             
        
        
        
Answer:
-8
Step-by-step explanation:
-21-(-13)
=-21+13
=-8 is the answer......
 
        
                    
             
        
        
        
If triangle ABC is equilateral,solve for X56x-308
        
                    
             
        
        
        
Answer:
440 cm ²
Step-by-step explanation:
216 cm² +24 cm²= 440 cm²