1) R= a) ]-∞,∞[ b) [-∞,∞] c) Q∩Q` 2) the set of non-negative real numbers= a) ]0,∞[ b) ]-∞,0[ c) [0,∞[ d) ]-∞,0] 3) 0 [-1,4[ a) ∈ b) ∉ 4) If X=[2,5[ and Y=[-1,3[ find X∪Y a) [-1,5[ b) [-1,5] c) [2,3[ d) ] -1,5[ 5) ∛-125 ] -√25,√25] a) ∈ b) ∉

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