SOLUTION: Need help please.. Thanks How many of this succession terms -12,-7,-2,3,8...need to be sum so the total will be 105 ?

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Question 1008776: Need help please.. Thanks
How many of this succession terms -12,-7,-2,3,8...need to be sum so the total will be 105 ?
Found 2 solutions by farohw, MathTherapy:
Answer by farohw(175)   (Show Source): You can put this solution on YOUR website!

In this arithmetic sequence, each term is added by 5 which is the common difference. To obtain a sum of 105:

-12, -7, -2, 3, 8, 13, 18, 23, 28, 33

If you add these ten terms, your sum will be 105.


Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!

Need help please.. Thanks
How many of this succession terms -12,-7,-2,3,8...need to be sum so the total will be 105 ?


Use the formula for the sum of the terms of an AP: , with:

 being the sum of the series

  being the number of terms (UNKNOWN)

 being the 1st term

  being the common difference between the terms

Find n. 

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