Question

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Answer 1

19. { x ∈ Z | -8 < x < 3 } = { -7,-6,-5,-4,-3,-2,-1,0,1,2 }

20. { x ∈ Z | -12 < x < 25 } = { -11,-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24 }

21. { x ∈ Z | x < |2| } = { -∞, ... , -3,-2,-1,0,1 }