Let f(x)= x^5-5x+3
1-Find f'(x) and f"(x).
2-Find the intervals on which f(x) is increasing or decreasing.
3-Find the local maximum and minimum of f(x), if any.
4-Find the intervals on which the graph of f(x) is concave up or concave down.
5-Find the points of inflection, if any.