Average change in altitude per minute
216.12÷2.4
=90.05m
        
                    
             
        
        
        
Answer: 28 
Step-by-step explanation:
add them all of them up then simply  subtract 46 from 18 and youll get your final answer which is 28 
hope this helps :)
 
        
             
        
        
        
Answer:
2 books
Step-by-step explanation:
1+1=2