(a) Plot the parametric space curve of

\[ \begin{aligned} & x(t)=t \\ & y(t)=t^{2} \\ & z(t)=t^{3} \quad 0 \leq t \leq 3. 0\end{aligned}\]

(b) $z=-7 /\left(1+x^{2}+y^{2}\right) \quad|x| \leq 10,|y| \leq 10$