Thats correct, I solved that part of the problem and yes indeed I multiply those transfer function ... and was a little tricky because Partial Fraction have to be use but mission accomplish in that part ... also d1 and C3
In the D2 is when the Apocalypse strike with the first horseman ...
A convolution integral have to be perform that i don't know how to handle.
d2) Find h(t) using h1(t) and h2(t) and using Time Convolution
Thanks CB, kudos for You bro !