Sophie is adding a new room to her house she knows the total area will be 70 square feet and she knows the length will be 10 fee
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So, we know the sum of the first 17 terms is -170, thus S₁₇ = -170, and we also know the first term is 2, well
well, since the 17th term is that much, let's check what "d" is then anyway,
well, since the 17th term is that much, let's check what "d" is then anyway,