Respuesta :

altavistard
Note that you get 2.5 from 9 by subtracting 6.5.  You get -4 from 2.5 by subtracting 6.5.  Thus, the common diff. is -6.5.
musiclover10045
Subtract the first s numbers::

9-2.5 = 6.5

Now subtract that from the 2nd number to see if it equals the next number in the sequence:

2.5 - 6.5 = -4

-4 - 6.5 = -10.5

The common difference is subtracting 6.5 ( -6.5)

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