Answer
(a) $0,4$.
(b) $[0,4]$.
(c) $(-\infty,0)\cup(4,\infty)$.
Work Step by Step
(a) Use the given graph, we can identify the intersects $(0,2),(4,2)$, thus the solutions to $f(x)=g(x)$ are $x=0,4$.
(b) $f(x)\le g(x)$ happens when $0\le x\le 4$ or $[0,4]$.
(c) $f(x)\gt g(x)$ happens when $x\lt0$ or $x\gt 4$, that is $(-\infty,0)\cup(4,\infty)$.
