Max' brother is M-6 years old.
        
             
        
        
        
Answer: it might be D
Step-by-step explanation: I think so on edge -4 must be factored from -4x^2-7
 
        
                    
             
        
        
        
The length of the longest slide is 5 inches. he other two sides will be 4  inches in length.
<h3>Length of the longest slide</h3>
Isosceles triangle
Given:
Total length=13 inches
Hence:
AC=BC<AB
Let AC=BC=x-1 inches
AB=x inches
Thus:
x-1+(x-1)+x=13
3x-2=13
3x=13+2
3x=15
divide both side by 3x
x=15/3
x=5 inches 
Hence:
Other two side
x-1=5-1=4 inches
Therefore the length of the longest slide is 5 inches. he other two sides will be 4  inches in length.
Learn more about Length of the longest slide here:brainly.com/question/7807143
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87.5 percent
Reason: 40/40-5/40 is 35/40. Divide 35/40 and you get 0.875. Multiply by a hundred and you get 87.5%
 
        
             
        
        
        
Perimeter of a triangle is the sum of measures of its all three sides, let the other be y, 
we know, 




hence, measure of the third side is 6x + 1