List the elements of the following set : {x : x ∈ Z and x 2 ≤ 4}

{x : x ∈ Z and x 2 ≤ 4} When x 2 = 4 x = = 2 or -2 When x 2 = 1 x = = 1 or -1 When x 2 = 0 x = = 0 Hence, the elements are = -2, -1, 0, 1 and 2.

List the elements of the following set :
{ x : x = 2y + 5 ; y ∈ N and 2 ≤ y < 6 }