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How far away is the nearest black hole? 1200 light years or 3000 light years? i'm getting conflicted answers? Calculate s31 for the arithmetic sequence in which a9=17 and the common difference is d=-2.1? If no wall give me a solution? Write a recursive formula for the arithmetic sequence (a(n)=(2,7/2,5,13/2...)? How do you know if a sample is completely wrong ? For a 95 percent confidence interval?