Answer
(a) $m=0$, $b=4$.
(b) see graph.
(c) domain $(-\infty,\infty)$, range $\{4\}$.
(d) $0$
(e) constant.
Work Step by Step
Given $G(x)=4$, we have:
(a) the slope $m=0$, y-intercept $b=4$.
(b) see graph.
(c) the domain $(-\infty,\infty)$, the range $\{4\}$.
(d) the average rate of change is the same as the slope $R=0$
(e) the function is constant.