Answer:
x = 
Step-by-step explanation:
Applying altitude- on - hypotenuse theorem.
(leg of large Δ )² = ( part of hypotenuse below it ) × ( whole hypotenuse )
x² = 3 × (3 + 7) = 3 × 10 = 30 ( take square root of both sides )
x = 
 
        
             
        
        
        
14-4x=2y
divide both sides by 2
7-2x=y
subsitute 7-2x for y
7-2x+2x=7
add like terms
7=7
true
therefor these 2 equations are the same and there are an infinite number of equations
answer is C
        
                    
             
        
        
        
n - 4 = 16   Given
   + 4  + 4   Cancel out 4 to isolate n variable
n = 20
Prove. 
20 - 4 = 16
16 = 16 
True. 
 
        
                    
             
        
        
        
Answer:
there are 10 of the other kind of cars
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
8-2 and 10-3
Step-by-step explanation: