so i'm given the graph of f'(x) without its equation or the equation of f(x) but i need to find:

- what intervals f(x) is decreasing on

- what intervals f(x) is increasing on

- values of x where f(x) has horizontal tangent

- values of x where f(x) has relative maximum

- values of x where f(x) has point of inflection

the graph given decreases until (1,0), increases until max at (6,6), then decreases passing through (9,1)

HELP!