SOLUTION: What is the mean of the terms in the arithmetic sequence 13,29,45,...,141,157?

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Question 980510: What is the mean of the terms in the arithmetic sequence 13,29,45,...,141,157?
Answer by Edwin McCravy(20065) About Me  (Show Source):
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The average of the first and last terms:

%2813%2B157%29%2F2%22%22=%22%22170%2F2%22%22=%22%2285

Edwin