Question: Problem 4. Sketch the following signals: a) x (t) = u(t) +5u(t-1)-2u(t-2) x(t)=r(t)-r(t-1)-u(t-2) b) c) x(t)=2u(t)+8(t-1) d) x(t)= u(t)u(a-t), a>0 e) x (t)= u(cost)

Problem 4. Sketch the following signals: a) x (t) = u(t) +5u(t-1)-2u(t-2) x(t)=r(t)-r(t-1)-u(t-2) b) c) x(t)=2u(t)+8(t-1) d) x(t)= u(t)u(a-t), a>0 e) x (t)= u(cost) Note: 8(t) is the unit impulse (see p. 33 of the class notes).

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