does the answer help you.
 
        
             
        
        
        
3(2)-18=-12 
6-18 = -12
-12 = -12
        
             
        
        
        
Answer:
<u>Percent air is calculated as:</u>
- Percent air = Current amount/Total amount *100
<u>Solve for total amount of air:</u>
- Total amount  = Current amount / Percent air * 100
Substitute the values in hand to get the answer
 
        
             
        
        
        
Answer:
answer...
Step-by-step explanation:
This is the answer.