Which term of the arithmetic sequences is 18 given A1=7 and A2=2?

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If a1 = 7, the common difference is -5. If this is arithmetic sequence, and we're looking for the term of 18, then it's not possible that it's term is -5/6, based on my solution. So maybe you can check the information posted? Or are we looking for the 18th term, not the term of 18? They are not the same.
maybe she is looking for the 18th term
If the inquirer is looking for the 18th term, the question has to be re-phrased.
Yeah

Answers

2016-06-28T17:23:23+08:00
A₁₈ = a₁ + (n-1)d
a₁₈ = 7 + (18-1)-5
a₁₈ = 7 + (17)-5
a₁₈ = 7 - 85
a₁₈ = - 78
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