Answer:
10
Step-by-step explanation:
 
        
             
        
        
        
Answer:
4 multiplied by sq rt of 5
Step-by-step explanation:
 
        
             
        
        
        
691/1000 is already in its simplest form, for 691 is a prime number and it cannot be reduced by any number other than 1 and 691. (and 1000 is not divisible by 691 also)
691/1000 in its simplest form is 691/100~
        
                    
             
        
        
        
Answer:
(21, 2 )
Step-by-step explanation:
Given the 2 equations
y = -  x + 9 → (1)
 x + 9 → (1)
y =  x - 12 → (2)
 x - 12 → (2)
Substitute (2) into (1)
 x - 12 = -
 x - 12 = -  x + 9 ( add
 x + 9 ( add  x to both sides )
 x to both sides )
x - 12 = 9 ( add 12 to both sides )
x = 21
Substitute x = 21 into either of the 2 equations and evaluate for y
Substituting into (2)
y =  × 21 - 12 = 14 - 12 = 2
 × 21 - 12 = 14 - 12 = 2
Solution is (21, 2 )