How do you tell whether the sequence $3, 5.5, 8, 10.5, 13$ $3, 5.5, 8, 10.5, 13$ is arithmetic?

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Answer 1 · 2018-02-15T04:43:31

There is a common difference of $2.5$ $2.5$

If there is a common difference, the sequence is arithmetic.

$5.5 - 3 = 2.5$ $5.5 - 3 = 2.5$

$8 - 5.5 = 2.5$ $8 - 5.5 = 2.5$

$10.5 - 8 = 2.5$ $10.5 - 8 = 2.5$

and so on.

Hope that makes sense!

How do you tell whether the sequence 3,5.5,8,10.5,133, 5.5, 8, 10.5, 13 is arithmetic?