Help identify sequence graphed please?

Question

anonymous · Answer

http://gyazo.com/c09ad63e5b5aa361ad0ceb5750cfc009 these are choices and this is graph. Please show me how to get the graph?

dumbcow · Answer

well graph is increasing so exponential base must be greater than 1

then plug in a point to check if the function matches with the graph

anonymous · Answer

Where do I plug in? the an place?

dumbcow · Answer

(x,y)  ---> plug "x" in for n , "y" for a_n

anonymous · Answer

Dumbcow is right honestly.
(x, y) --> (a, n)

mathmale · Answer

All of these four possible answers are clearly EXPONENTIAL functions (not quadratic ones).  

You might want to spend some time thinking about these possible answers.  How would you judge their appropriateness or lack of appropriateness?

For example:$$a _{n}=\frac{ 1 }{ 3 }3^{n-1}$$ can be re-written and simplified:$$a _{n}=3^{-1}3^{n-1}=3^{-1+n-1}=3^{?}$$

mathmale · Answer

The graph quickly tells us that this function increases with x.  What does that tell you about the base of this exponential function?