Us the app desmos it’s good
        
             
        
        
        
141.999 rounded to the nearest
tenth = 142
hundreth =142
ten = 140 
hundred = 100 
        
             
        
        
        
Angle F is equal to angle G so 5x + 18 = 7x-12 so you would solve for x which would equal 15
        
             
        
        
        
Answer:
coefficent matrix
Step-by-step explanation:
P. 366
"If the column of constant terms is not included, the matrix reduces to that of the coefficent matrix of the system"
-1 -3 -1
9 -9 -1
-1 -3 4
 
        
                    
             
        
        
        
X + 4 = 12
This is because the question gives you everything you require for this sentence to be formed. 12 is the final answer. 4 is added on and 

 is basically the number that is to be found.