SOLUTION: The tenth term of an arithmetic sequence is 20 and the fifth term is 0. Find the sum of the terms from the eighth to the eighteenth, inclusive.
Please help! Thank you!
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Question 878423: The tenth term of an arithmetic sequence is 20 and the fifth term is 0. Find the sum of the terms from the eighth to the eighteenth, inclusive.
Please help! Thank you!
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
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Subtract these two terms,
Then,
So,
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So the the sum of the terms from 8th to 18th is,
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