WeBWorK using host: https://webwork.pcc.edu, format: simple, seed: 4876, course: orcca

The domain of $w$ is $(-\infty,\infty)\text{.}$ The parabola opens downward so the range is $(-\infty,-11]\text{.}$

The domain of $u$ is $(-\infty,\infty)\text{.}$ The parabola opens upward so the range is $[20,\infty)\text{.}$

The domain of $y$ is $(-\infty,\infty)\text{.}$ The parabola opens downward so the range is $(-\infty,0]\text{.}$

The domain of $z$ is $(-\infty,\infty)\text{.}$ The parabola opens upward so the range is $[-4,\infty)\text{.}$