S.O.S. Mathematics CyberBoard

Okay so my test tomorrow is over finding the rule of n in a sequence for example

1 2 3 4 5 10 20
8 9 10 11 12 17 27

and then you have to find the rule for n and i have no clue how to or i get confused HELP
heres another example on my worksheet

1 2 3 4 5 10 20
-2 6 14 22 30 70 150 and now you have to find the rule for n

Um....it looks like every time n goes up, you get your number to go up by 1. Still, there's no guarantee that's the rule, I can think of infinitely many other rules that could work as well.

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You probably mean this:

I presume you're to simply "look" for a pattern.
In 1st one, you can "see" that every term is 7 less than corresponding term number.
In 2nd one, you can "see" that terms are increasing by 8.

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