examday

/TMUA

The graph of the derivative function $y=f'(x)$ of the function $y=f(x)$ is shown in the figure. How many of the following conclusions are correct?

• I. $f(x)$ is increasing on $(-3,-1)$.
• II. $f(x)$ is increasing on $(1,2)$.
• III. $f(x)$ is decreasing on $(1,3)$.
• IV. $f(x)$ obtains a minimum value when $x=4$.