The answer is 
D 18 3 
I'm pretty sure 
        
             
        
        
        
20? I’m not for sure maybe look in the book? That’s the answer I got and it was right
        
                    
             
        
        
        
Answer: -5x-8y=-5
Step-by-step explanation:
add right sides of equation and even them with result of adding right sides of equation
4x-4y-9x-4y=-2-3
-5x-8y=-5
 
        
             
        
        
        
Answer: 100$.
100% - 80% = 20%
20$ / 0.20(20%) =100$ 
        
             
        
        
        
Answer:
The value of x is 3
Step-by-step explanation:
∵ Quadrilateral ABCD is congruent to quadrilateral JKLM
∴ AB = JK and BC = KL
∴ CD = LM and AD = JM
∵ BC = 8x + 7
∵ KL = 31
∵ BC = KL
→ Equate their right sides
∴ 8x + 7 = 31
→ Subtract 7 from both sides
∵ 8x + 7 - 7 = 31 - 7
∴ 8x = 24
→ Divide both sides by 8 to find x
∴  =
 = 
∴ x = 3
∴ The value of x is 3