Can anyone do MATLAB Simulink and plot and give me solution

$1.$ Find the equivalent transfer function of the negative feedback system of Figure below if

$\backslash ($ G$($s$)=\backslash$frac$\{$K$\}\{$s$($s$+2)^\{2\}\}\backslash )$ and $\backslash ($ H$($s$)=1,$ K $\backslash )$ is the gain.

Using trial and error and Ruth table methods below

$2.$ Find a value of gain to yield closed$-$loop, overdamped system. Use Simulink to plot the step response of the system.

$3.$ Find a value of gain to yield closed$-$loop, underdamped system. Use Simulink to plot the step response of the system.

$4.$ Find a value of gain to yield closed$-$loop, marginally stable system. Use Simulink to plot the step response of the system. Also, find the frequency of oscillation at the value of gain that makes the system marginally stable.