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BoatsRUs built 7 canoes in January of this year and then each subsequent calendar month they built twice the number of canoes they had built the previous month. How many total canoes were built by BoatsRUs by the end of September of this year?

 Dec 26, 2020
 #1
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BoatsRUs built 7 canoes in January of this year and then each subsequent calendar month they built twice the number of canoes they had built the previous month. How many total canoes were built by BoatsRUs by the end of September of this year?   

 

                                       7  Jan  

                                     14  Feb  

                                     28  Mar  

                                     56  Apr  

                                   112  May  

                                   224  Jun  

                                   448  Jul  

                                   896  Aug  

                                 1792  Sep  

 

                                 3577  Total 

.

 Dec 26, 2020
 #2
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Geometric sequence  r = 2   a1 = 7  

S9 =  7(29-1) / (2-1) = 3577 canoes

 Dec 26, 2020

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