Write the following as intervals

Tuesday, 8 April 2014
Write the following as intervals:
(i) {x: x ∈ R, -4 < x ≤ 6}
(ii) {x: x ∈ R, -12 < x < -10}
(iii) {x: x ∈ R, 0 ≤ x < 7}
(iv) {x: x ∈ R, 3 ≤ x ≤ 4}

Answer
(i) {x: x ∈ R, -4 < x ≤ 6} = (-4, 6]
(ii) {x: x ∈ R, -12 < x < -10} = (-12, -10)
(iii) {x: x ∈ R, 0 ≤ x < 7} = [0, 7)
(iv) {x: x ∈ R, 3 ≤ x ≤ 4} = [3, 4]


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