SOLUTION: Given a1=3, and a5=-17 (the first and the fifth number in an arithmetic series) what's a20 (the twentieth term in the series)

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Question 1197683: Given a1=3, and a5=-17 (the first and the fifth number in an arithmetic series) what's a20 (the twentieth term in the series)
Found 2 solutions by ewatrrr, MathTherapy:
Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!

Hi 
arithmetic series:  a1=3, and a5=-17
    | Need to Know
   d = -5
 
    a20 = -92

Wish You the Best in your Studies.


Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!
Given a1=3, and a5=-17 (the first and the fifth number in an arithmetic series) what's a20 (the twentieth term in the series)
Common difference, or 
                        

                     ------ Formula for a specific term of an AP
                    ----- Substituting 20 for n, 3 for a1, and - 5 for d
AP's 20th term, or

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