SOLUTION: If the first term in an arithmetic sequence is 15 and the tenth term is 69. What is the fourth term in the sequence?

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Question 1036157: If the first term in an arithmetic sequence is 15 and the tenth term is 69. What is the fourth term in the sequence?
Answer by josgarithmetic(39617) About Me  (Show Source):
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Any term at index n and common difference d is 15%2B%28n-1%29%2Ad.

Description means 15%2B%2810-1%29%2Ad=69.

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