(Solved): I will Rate good =3 (1) (,1)(3,) (a) Find the open intervals on which f(x) is pos ...

$=3\mid$ (1) $(-\infty ,1)\cup (3,\infty )$ (a) Find the open intervals on which $f^{\prime }(x)$ is positive. (Enter your answer using interval notation.) Describe the corresponding behavior of $f$. $f$ is increasing. fis decreasing. $f$ is concave upward: fie concave downward. (b) Find the open intervals on which $f^{\prime }(x)$ is negative. (Enter your answer using intervat notation.) Describe the corresponding behavior of $f$ $f$ is increasing. $f$ is decreaning. $f$ is concave upward. $f$ is concave downward. (C) Find the open intervals on which $f$ ' is increasing. (Enter your answer using interval notation.) Describe the corresponding behavior of $f$. $f$ is increasing. fir decreasing $f$ is concave upward. $f$ is concawe downward. (d) Find the open intervats on which $/$ ' is decreasing. (Enter your answer using interval notation.) Describe the corresponding behavior of $f$. fis increasing. The decreasing. Ch conctve upwerd. fis concave downwatd.