3.) Consider the following process presented by the block diagram X(s) 0.55e-0.5s Y(s) 2s+1 3.4e-2.1s 2.7s+1 Y(s) a.) Determine Y2(t) for this system in response to a unit step change in input, X(t), assuming all functions are expressed in terms of deviation variables. b.) Determine an approximate first-order with dead time transfer function model for this system. c.) Plot both the functions Y2 (t) determined in parts a.) and b.) on the same graph.