$8.$ Create a row vector with $3$ entries containing

a$.$ the sum of the entries for the $3$ columns given in matrix A $($from

problem $1).$

b$.$ the product of the entries for the $3$ columns given in matrix A $($from

problem $1).$

$9$a$.$ Create a $4$ x $5$ matrix of all $0$s$.$

$9$b$.$ Create a row vector containing twenty $1$s$.$

$9$c$.$ Create a $5$ x $5$ identity matrix.

$10.$ Consider the vectors cur $=[4567]$ and volt $=[2893]$

containing the currents $($in Amps$)$ through and the voltages $($in Volts$)$

across $4$ particular resistors at some point in time. Create a vector

containing the power dissipated by each of the $4$ resistors.