Predefined functions and series

[URL=http://imageshack.us/photo/my-images/839/ctest.png/][IMG]http://img839.imageshack.us/img839/6190/ctest.png[/IMG][/URL]

1. question series, it's actually a set of switch function maybe, when user put 1.. this run, when put 2.. this functions run. well I get the rest but not this one. what does it mean? *n is read in main function

the rest two are predefined function.
a) is it just pow(x,(y-3)) ?
b) I dont know any predefined function to find the roots of equation. they ask for predefined not user defined
1. Eh? Don't you know what a series is or...?
a) Yes.
b) You already have pow, so what's the problem?
maybe didnt see the pic. go here http://img839.imageshack.us/img839/6190/ctest.png
1.I mean the user put the n? and what's the codes?
b) see the pic. not square root but root of polynomial
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