Others Maths Puzzle Logical Reasoning

if (f 0 f (x) ) is 1/x then f(x) is ?

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A and B together can do a piece of work in 24 days ,which B and C together can do in 32 days.After A has been working at it for 10 days and B for 14 days, C finishes in 26 days.In how many days C alone will do the work? give three values of x that give the same value f y for: y=9x^100-4x^98+198