Let A = {z = x + y = C: ≥1}. (1.1) Show that A = {z = x+iy € C: y ≥ 1; (x, y) = (0,4)}. (1.2) Sketch the set A. (1.3) Is z = 5+i a boundary point of A? Provide reasons for your answer. (1.4) Is A open, closed, both or neither? Provide reasons for your answer.

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