Answer:
 18
Step-by-step explanation:
10 +3 =13 +5 =18 
so that is how you get the answer 18 it's simple really 
 
        
             
        
        
        
Answer: -4v+9
Step-by-step explanation:
u - 5 = -4(v - 1)
u - 5 = -4v + 4
 +5 +5
u = -4v + 9
 
        
             
        
        
        
Answer:
4
Step-by-step explanation:
Given
x² - 4x + 10 = 0
subtract 10 from both sides
x² - 4x = - 10
To complete the square
add ( half the coefficient of the x- term )² to both sides
x² + 2(- 2)x + 4 = - 10 + 4
(x - 2)² = - 6
To complete the square add 4