Answer:
Step-by-step explanation:

 
        
             
        
        
        
This answer is 272 I know because I did it vertically
        
                    
             
        
        
        
Answer:
B. n-3
Step-by-step explanation:
If x is an even integer, the next consecutive even integer = x + 2
Since (n-5) is even, the next consecutive even integer = (n-5) + 2 = n-3
 
        
             
        
        
        
Answer:
  and
 and 
Step-by-step explanation:
Given:
Equation 1:

Simplifying the above equation by dividing both sides by 100


Equation 2:

Simplifying the above equation by dividing both sides by 400.


Now the system of equation is:
(1a) 
(2a) 
Solving by elimination
Multiplying equation (2a) with 

(2b) 
Adding equations (1a) and (2b) in order to eliminate 
       
+  
We get 
∴ 
Plugging  in equation (2a).
 in equation (2a).

Adding  both sides.
 both sides.

∴ 
 
        
             
        
        
        
The first and last choices are true.