Q$4-$ For each impulse response listed below, determine whether the corresponding system is $($i$)$memoryless$,$ and $($ii$)$causal

$h(t)=e^{-2t}u(t-2)$

$h(t)=u(t+3)$

$h(t)=tu(t+2)$

Define $x(t)=t(u(-t-1)-u(-t+1)),$ where $u(t)$ is the unit step function. Plot $x(t).$