Answer: 55
Explanation:
 Find the area of the entire shape: 7x9=63
 Find the area of the missing piece: 8
 7-3=4 9-5=4 4x4=16 16/2=8
 Find the area: 63-8=55
        
             
        
        
        
The answer and equation is 17 - 19 = -2
        
                    
             
        
        
        
Answer:
The change in delta x would be 0 in the second option because the change is exactly the same.
 
        
                    
             
        
        
        
Answer:
15/8 alphas = 1 gamma 
Step-by-step explanation:
4 gammas = 5 beta 
beta = 4/5 • gamma 
2 betas = 3 alphas
beta = 3/2 • alpha 
beta = beta
4/5 • gamma = 3/2 • alpha 
multiply each side by 5/4 
5/4 • 4/5 • gamma = 5/4 • 3/2 • alpha 
gamma = 15/8 • alpha