Which formula can be used to describe the sequence? negative 2 and 2 thirds comma negative 5 and 1 third comma negative 10 and 2 thirds comma negative 21 and 1 third comma negative 42 and 2 thirds comma dot dot dot

Compare consecutive terms by dividing: (−16/3) ÷ (−8/3) = 2. The next terms also double, so each term is 2 times the previous term. Therefore, the rule is f(x + 1) = 2f(x), which is choice D.

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