A=8

PLEASE TRY AND ANSWER 2 QUESTIONS OUT OF THE 4

2. Chapter 3 questions. (a) (10 pts. Consider the system with input *(-) and output y(s) such that y(t) = 2(t-a+3)+u(t-a+6), where u() is the unit step (not the input). Determine whether the system is causal and/or time- invariant, proving your answers. (b) (10 pts.) Consider a SINGLE system for which an input of 2. [n] = un - a gives output an (10+)"un-a-1) and an input of