Answer:
 1
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
(3, 15) and (4, 12)
Step-by-step explanation:
x2 - 7x+12 = 0 factors to (x - 4)(x - 3) = 0, and so x:  {3, 4}.
Since y= -3x + 24, y = 15 when x = 3 and y = 12 when x = 4.  The solutions are thus (3, 15) and (4, 12).  This is the third answer choice.
 
        
                    
             
        
        
        
The formula of a perimeter is:2(L+l) or
2*L+2*l