1. [-3, 3] U (-∞, -4) U (4, ∞)
2. (-∞, -4) U (4, ∞)
3. (-∞, -3) U (4, ∞)
4. )(-∞, -3) U (3, ∞)
[-3, 3] U (-∞, -4) U (4, ∞)
1. [IR, the set of all real numbers
2. φ, the empty set
3. {x є IR : x < 0}
4. {x є IR : x > 0}
φ, the empty set
1. a = c
2. b = d
3. ad = bc
4. ab = cd
ad = bc
1. 2k+1 -1
2. 2(2k+1 -1 )
3. 3(2k+1 -1 )
4. 4(2k+1 -1 )
2(2<sup>k+1</sup> -1 )
1. 1
2. 2
3. 3
4. 1 / 2
1
1. 1
2. 2
3. 3
4. 4
4
1. {6k : k Є Z}
2. {12k : k Є Z}
3. {18k : k Є Z}
4. {24k : k Є Z}
{6k : k Є Z}
1. 64
2. 72
3. 81
4. 900
81
1. 110
2. 115
3. 120
4. 135
120
1. r. 2r
2. (2r-1)2r
3. r. 22r+1
4. (2r+1) 2r
(2r+1) 2<sup>r</sup>