Mr. Brown's class is collecting books for a book drive. They started with 2 books. On the first day, they had 6 books. On the se cond day they had 18 books. Write an equation that models this situation.
       
      
                
     
    
    
    
    2  answers:
            
              
we are given 
Let's assume total number of books =y
number of days =x
They started with 2 books
so, first term is 2
second term is 6
third term is 18
we can see that this is geometric series
so, firstly we will find common ratio
total number of terms is x+1
now, we can find nth term
now, we can plug back r 
we get 
...........Answer 
 
                                
             
                    
         	
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