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Do you know what each of those sequences look like?

Test if it follows each by using a couple of the points

I am ust not good with the arithmatic stuff like what?

If it increases the same amount for each increase in n, it is arithmetic

or decreases

so Its geometric, I am assuming?

a geometric sequence will have the ratio of any two consecutive terms as a constant same value

http://www.differencebetween.com/difference-between-arithmetic-sequence-and-vs-geometric-sequence/

so the answer is c or d, not a or b.

looks like it is decreasing by 40 for every increase in n

arithmetic, common difference in sucessive terms

okay. so I mean a or b.. I was reading it wrong

so the common difference is -40?

yes, you see you are taking the previous term and adding (-40) to it every time

an = a(n-1) - 40

Can you help with another?

If it were geometric, you can test out the ratio to see, by
\[\frac{ a _{n+1} }{ a _{n} } = r\]

the ratio will be a value for geometric, not the difference

sorry dinners ready... Maybe later, if ur on you could help? ::)