In each of Problems 5 through 8: a. Sketch the graph of the given function. b. Express f(t) in terms of the unit step function uc(t). 5. f(t) = {0, 0 ≤ t < 3,
{-2, 3 ≤ t < 5,
{2, 5 ≤ t < 7,
{1, t ≥ 7