Is 25, 19, and 13 an arithmetic or geometric sequence?

A geometric sequence is one in which any term divided by the previous term is a constant.

This sequence would be geometric if 19/25 = 13/19.  Are those equal?

In an Arithmetic Sequence, the difference between one term and the next is a constant.

This sequence would be arithmetic if 19-25 = 13-19.  Are those equal?

you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.

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