There's an isosceles obtuse triangle.
 
        
        
        
In order to do this, all you have to do is divide the area by the width
        
             
        
        
        
2/7x - 2/5x = 8
multiply both sides by 35
= 10x - 14x = 280
combine 10x and 14x
= -4x = 280
divide both sides by -4
x= -70
        
             
        
        
        
Answer:
16. q
17. -4
18. 0
Step-by-step explanation:
16. q
17. -4
18. 0