Let $u(t)$ be the Heaviside step function defined by $\displaystyle u(t) = \left\lbrace \begin{array}{lcl} 0 && \mbox{ if } x \leq 0, \\ 1 && \mbox{ if } x > 0. \end{array} \right.$

1. Evaluate the function ${5u\!\left(t-3\right)}$ when $t$ is $2$, $3$, and $4$ and enter your answers as a comma separated list.
   • help (numbers)
2. Suppose the answer is the function ${5u\!\left(t-3\right)}$.
   • help (formulas)