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}