q$1$ What are the values of $z$ for which the value of $x(z)=0?$

Select one:

a$.$ Solutions

b$.$ None of the mentioned

c$.$ Poles

d$.$ Zeros

q$2$ Assume we have an LTI system $H,$ and its impulse response $h[k]$ Then if the input signal is $x[k],$ the output signal is $y[k]=x[k].h[k]$

Select one:

True

False

What is the $z-$transform of the signal $x(k)=2(0,4),u(k)?$

Select one:

a$.\frac{2}{1-0\mathrm{.}4z^{-1}}$

b$.2\frac{z}{1-0\mathrm{.}4z^{-1}}$

c$.\frac{2}{1+0\mathrm{.}4z^{-1}}$

d$.\frac{2}{1-0\mathrm{.}4z^{-2}}$