Step-by-step explanation:
so he already down 20 ft so he ascends (goes up) 9 feet, so hes at 11 feet right now. then he descends 12 (goes down) feet so hes at 23 feet. lastly he ascends 15 feet (goes up) more. so the answer is 8
 
        
             
        
        
        
Answer:
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Step-by-step explanation: 3jj3j3j3jj3j3j3j3j3j3rhh4837773
 
        
             
        
        
        
Answer:
So I believe your just graphing here like a line or bar graph. Look at images in Google for references if needed.
 
        
                    
             
        
        
        
Answer is 20, hope this helps BRAINLIEST?