Answer
stretch $\frac{1}{x}$ vertically by a factor of 2.
(a) domain $(-\infty,0)U(0,\infty)$
(b) range $(-\infty,0)U(0,\infty)$
(c) increasing $none$
(d) decreasing $(-\infty,0)U(0,\infty)$
Work Step by Step
The graph of $f(x)=\frac{2}{x}$ can be obtained by stretching $\frac{1}{x}$ vertically by a factor of 2. See graph, we can identify the following:
(a) domain $(-\infty,0)U(0,\infty)$
(b) range $(-\infty,0)U(0,\infty)$
(c) increasing $none$
(d) decreasing $(-\infty,0)U(0,\infty)$