Answer:
38
Step-by-step explanation:
 
        
             
        
        
        
Answer:
9
Step-by-step explanation:
Let's say Mark is M and his brother is B.
M+5=B
M+B=23
Now we can solve using subsitution.
M+M+5=23
(Subtract 5 from both sides)
2M=18
M=9
Hope this helped!
 
        
             
        
        
        
Parallel lines would have to have the same slope so the green line also has a 1/5 slope
        
             
        
        
        
Answer:
B
Step-by-step explanation:
x² + 9x
to complete the square
add ( half the coefficient of the x- term )² to x² + 9x
= x² + 2( )x + (
 )x + ( )²
 )²
= x² + 9x +  ← the value of c
 ← the value of c
= (x +  )² ← a perfect square
 )² ← a perfect square
 
        
                    
             
        
        
        
Answer:
D!
Step-by-step explanation:
its pretty hard to explain but let me put it like this- it crosses through (0,0) and it mirrors itself in the 1st and 3rd quadrants