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R = { x ∈ R; x ≥ −4 } R = [ −4; + ∞) R = [ −4; 2) U( 2; + ∞)

8) R = { x ∈ R; −1 ≥ x ≥ 4 }

R =( −∞; −1 ] U [ 4; + ∞) R =( −∞; + ∞) ∉( −1; 4)

9) { −2, −1,0,1,2,4,5,7 }

R = { x ∈ R; −2 ≤ x ≤ 7; x ≠ 3⋀x ≠ 6 } R = [ −2; 7 ] ∉ { 3,6 }