Find a common denominator which is 12
1*3=3   4*3=12  so 3 3/12
then 5*2=10   6*2=12     so 2 10/12
2 10/12+3 3/12= 5 13/12  
13/12= 1 1/12 plus 5= 6 1/12
so your answer would be 6 1/12
        
                    
             
        
        
        
You can give random values such as <span> (1,2.5) (2,9) (-1,2.5) (-2,9) and it is a parabola. You'll see that the range is (-infinte, 0] and the domain is (-infinit, infinite). </span>I hope that this is the answer that you were looking for and it has helped you.
        
                    
             
        
        
        
Answer:
= 4a + 3c + 13 
Step-by-step explanation:
(9+4a)+(4+3c)
= 9 + 4a + 4 + 3c
= 4a + 3c + 13