SOLUTION: How to you find the fourth term of an arithmetic series, given a1 = 20 and the sum (S subroot 10) = 335?

SOLUTION: How to you find the fourth term of an arithmetic series, given a1 = 20 and the sum (S subroot 10) = 335?

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Question 456892: How to you find the fourth term of an arithmetic series, given a1 = 20 and the sum (S subroot 10) = 335?
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!

==>
==> 335 = 5(40 + 9d)
==> 67 = 40 + 9d
==> 27 = 9d
==> d = 3.
==>
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