Step-by-step explanation:
First 
Outer
Inner
Last
First- 5x*2x=10x^2
Outer-5x*-1= -5x
Inner--7*2x= -14x
Last- -7*-1= 7
10x^2-5x-14x+7
you can simplify it further however thats the answer 
 
        
             
        
        
        
Answer:
1st one 3rd one and last kne
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
i think it is c because its a complete question and sentence if im wrong tell me ( ;
brainlyest would be nice btw ( ;
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
x=9 y=24
Step-by-step explanation: