SOLUTION: the sum of the first fifteen terms of an arithmetic terms progression is 270. find the first term and the common difference if the the fifteenth terms is 39.

Question 647305: the sum of the first fifteen terms of an arithmetic terms progression is 270. find the first term and the common difference if the the fifteenth terms is 39.
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi,

the sum of the first fifteen terms of an arithmetic terms progression is 270. 

find the first term and the common difference if the the fifteenth terms is 39

 ⇒ ,  = -3

  ⇒ ⇒  d = 3

and

   

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