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What's a Sequence?

TRY IT:

Find the next term:

-1 , 5 , 8 , 8 , 5 , -1 , ___

There's one last intro thing I need to tell you about.

There are finite sequences that just stop after a certain number of times.

Like this guy:

-3 , 1 , 5 , 9 , 13 , 17 , 21

And there are infinite sequences that keep on going forever and ever.

Like:

0 , 2 , 4 , 6 , 8 , 10 , 12 , ... These three dots means that it keeps going.