please solve every question $19$ Assume a source frequency $\backslash$omega $=100$ rad $/$ s$.$ The equivalent impedance Z$\_$a b seen by the source $($between terminals a and b $)$ is: A$)(10(2))\backslash$angle $(45^)\backslash$Omega B$)(10-$j $0\mathrm{.}1)\backslash$Omega C$)-$j $0\mathrm{.}1\backslash$Omega D$)$ j $10\backslash$Omega E$)$ None of the above $20$ The current i$($t$)$ in the circuit shown below is: A$)$ i$($t$)=5$ sin$(2$ t$-60^)$ A B$)$ i$($t$)=10$ sin$(2$ t$-30^)$ A C$)$ i$($t$)=5$ sin$(2$ t$+120^)$ A D$)$ i$($t$)=20$ sin$(2$ t$+120^)$ A E$)$ None of the above. $21$ What is the binary representation of $($ABC $1)\_16?$ A$)1011011011110110$ B$)0101010110100001$ C$)0001101010011001$ D$)1010101111000001$ E$)101101001000000122$ What is the $2\text{'}$s complement binary representation of $(85)\_10$ using $8$ bits? A$)00011101$ B$)10101010$ C$)01010101$ D$)10111011$ E$)1101110023$ The $6-$bit binary representation of $(-25)10$ using $2\text{'}$s complement is given by$...$ A$)100111$ B$)100110$ C$)011010$ D$)101111$ E$)01100124$ An $8-$bit computer that uses $2\text{'}$s complement is used to evaluate $(-35)+(+23).$ Which of the following is calculated by the computer as the answer? A$)00001100$ B$)11110101$ C$)01111110$ D$)11110100$