calculus help

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Produce graphs of f that reveal all the important aspects of the curve. Then use calculus to find the intervals of increase and decrease and the intervals of concavity.

f(x)= 1+(1/x)+(5/x^2)+(1/x^3)

find the interval of increase.


find the interval of decrease.


find the interval of where the function is concave up.


find the interval of where the function is concave down.


I have no idea about this question.

Thank you!!

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