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Which is thr common difference between the elements of the arthmetic sequence below -18, -22.5, -27,-31.5, -36

User Cybergoof
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\bf -18~~,~~\stackrel{-18-4.5}{-22.5}~~,~~\stackrel{-22.5-4.5}{-27}~~,~~\stackrel{-27-4.5}{-31.5}~~,~~\stackrel{-31.5-4.5}{-36}~\hfill \boxed{-4.5} \\\\\\ ~\hspace{34em}

User Emanouil
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