Answer:
Square root 112 Units. 
Step-by-step explanation:
See the image attached for the work.
 
        
             
        
        
        
X + 12 = 20
x + 12 -12 = 20 -12
x = 8
        
             
        
        
        
Answer:
-3, -2, 1
Step-by-step explanation:
 
        
             
        
        
        
Answer:
24
Step-by-step explanation:
Let x be the points he scored in his best game. x-8 would then represent each of his last 3 games.
(x-8)*3 = 2x
3x-24=2x
x=24
 
        
             
        
        
        
Answer:
117 feet squared
Step-by-step explanation:
Multiply the height (9 feet) by the width (13 feet).
9 x 13 = 117
117 feet squared
Note: squared is added when describing area (it's used as an exponent in numbers)