David earned $686.85, and Robert earned $896.36 this week. How much more did Robert earn than David? Enter your answer in the bo
2 answers:
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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,