Given functions are 


The total number of ducks and swans in the lake after n months can be determined by adding the functions s(n) and d(n).





Taking 2 as common, we get

Hence The total number of ducks and swans in the lake after n months is 
 
 
        
             
        
        
        
168 cubic inches
or 180cm3
        
             
        
        
        
Answer:
Step-by-step explanation:
- Let the value of a number 'a' be = 8/15
- Let the value of a number 'b' be = 2/3
The difference between the two numbers can be calculated by subtracting the numbers


          

           

           

           
           

            
Thus,
 
        
             
        
        
        
Subtract 9 from both sides