Answer
(a) $-9, 3$.
(b) $[-9,3]$.
(c) $(-\infty,-9)\cup(3,\infty)$.
Work Step by Step
(a) Use the given graph, we can identify the intersects $(-9,6),(3,6)$, thus the solutions to $f(x)=g(x)$ are $x=-9, 3$.
(b) $f(x)\le g(x)$ happens when $-9\le x\le 2$ or $[-9,3]$.
(c) $f(x)\gt g(x)$ happens when $x\lt-9$ or $x\gt 3$, that is $(-\infty,-9)\cup(3,\infty)$.
