I'm trying to create a graph in excel and how come when i put this into my graph

(21.8(151.1)^-1)100

I get undefined
and all my calculators on my computer also give me undefined

however my ti 83 gives me an answer around 19

3 answers

I got an answer around 14 or 14 1/2...
I'm not sure why its not letting you graph it. Try doing it on paper I guess and see if you get a reasonable answer. That's all I can suggest.
the way you typed it, I get
(21.8(151.1)^-1)100
= (21.8/151.1)(100)
= 14.42753..

the 100 at the end looks suspicious.
is it supposed to be an exponent?
now i'm trying to find a percent