calculus help
posted by Isik .
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!!

Play with this:
https://www.wolframalpha.com/input/?i=derivative+of+1%2B%281%2Fx%29%2B%285%2Fx^2%29%2B%281%2Fx^3%29+