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GodBless c:
 
        
             
        
        
        
Answer:
Step-by-step explanation:
Sally owes 7 dollars to Matthew. She opens her piggy bank and takes out 7 dollars. Now, how much money does she owe to Matthew? 
-7 + 7 = 0 
-7 + 7 is the same as  7 - 7
You can clearly see that 7-7 is 0.
 
        
                    
             
        
        
        
Let the unknown side be "z" inches
Through pythagoras:

Because the square of the two sides add up to the square of the hypotenuse in a right triangle.
This means that 



So the missing side is 16 inches 
Hope this helped
 
        
        
        
d) neither parallel or perpendicular 
 
        
             
        
        
        
Answer:
-3
Step-by-step explanation:
3 x 6 - 42/2 = 
18 - 42/2 = 
18 - 21 = 
-3