Let M = R and set Question 2 4= [(-1,5) N*]U ((8,9] (7,10]), B = {æ € R: \r-4|< A= 5x 15-51215} - 4 < 4 and (a) Give a simplified expression for A, Aº and the set A¹ of isolated points of A. (b) Give a simplified expression for B in interval notation, and for B and B'.

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