Answer:
I think the answer is 7;
Step-by-step explanation:
All i did was subtract Q11 from all 4 of its sides;
11=4=7
 
        
             
        
        
        
Carbon dioxide from the atmosphere dissolves in the surface waters of the ocean. Some of the carbon dioxide stays as dissolved gas, but much of it gets turned into other things. Photosynthesis by tiny marine plants (phytoplankton) in the sunlit surface waters turns the carbon into organic matter.
        
             
        
        
        
Answer:
She is wrong. 
Step-by-step explanation:
The mean score is 
7 + 8 + 3 + 0 + 2= 20
We then divide it by the number which is 5
20/5= 4.
Therefore, Maria is wrong. 
This is because she divided by 4 instead of 5, as she didn't include the rational number 0.
 
        
             
        
        
        
Answer: D 
Step-by-step explanation:
The values x = 2 and y = 5 make the equation true.