Ononot — If the sum of the first n terms is Sn = n^2 + 2n, what is th

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Arithmetic Sequenceshard

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If the sum of the first $n$ terms is $S_n = n^2 + 2n$ , what is the expression for the $n^{th}$ term $a_n$ and the value of the $10^{th}$ term?