Answer:
Number line graph with closed circle on 30 and shading to the right
because you already have 30 dollars and they need at least 120 but if they get more then 120 they can still hold the science fair.
THIS ANSWER ISN'T MINE. I TOOK IT FROM AN ANSWER TO THE SAME QUESTION ANOTHER USER POSTED. 
 
        
                    
             
        
        
        
Answer:
distrubutive
Step-by-step explanation:
 
        
             
        
        
        
Step-by-step explanation:
13x+7y-2x+6a
combine like terms
=13x-2x+7y+6a
=11x+7y+6a
simplified
 
        
                    
             
        
        
        
since triangles are similar
=》 21/9 = x/3
=》 x = 21×3/9 =7