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Solutions

  1. Answer: (These answers are not unique)
    1. 8, 15, 22, 29
    2. apple, pear, peach, plum
    3. 1/2, 1/3, 1/4, 1/5
    4. -8 , -6, -4, -2
    5. 6, 10, 15, 21

  2. Answer:
    1. \left \{ 2k+1 \; k \in \mathbb{Z}, 2 \leqslant k \leqslant 39 \right \}
    2. \left \{ x \in \mathbb{Q} \; | \; -1 < x < 1 \right \}
    3. \left \{ 2n \; | \; n \in \mathbb{Z} \right \}\
    4. \left \{ 9n \; | \; n \in \mathbb{Z}, -2 \leq n \right \}\ 

  3. Answer:
    1. True
    2. False
    3. True
    4. True
    5. False
    6. True
    7. False
    8. True