it's wrong because he put a closed circle on the nine when he was supposed to put an open circle because nine is not less than itself but the thing that he did right wad that he went to the left if it was a greater than or equal symbol then it would be correct 
hope this helps 
mark brianlest 
 
        
                    
             
        
        
        
Answer:
26
Step-by-step explanation:
25/750=0.033333
0.033333x780=26
 
        
             
        
        
        
Answer:
x=14√3 and y=28
Step-by-step explanation:
This is a 30, 60, 90 triangle. We have to multiply 14 by 2 to get the hypotenuse. In this case, the hypotenuse is y. 14x2 is equal to 28. Therefore, y=18. The long side is equal to the small side times the √3. Therefore, x is equal to 14√3. Therefore, x=14√3 and y=28. 
If this has helped you please mark as brainliest
 
        
             
        
        
        
The answer would be C, oxygen because there was not a sufficient amount.
        
                    
             
        
        
        
Answer:
8
Step-by-step explanation: