Given sets A, B, P, Q, and C, find their intersections. For example, find A intersect B where A = 1, 2, 3, 4, 5, 6, 7, 8, 9 and B = 2, 3, 5, 7.

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Here's a quick recap of the answers for the questions from the image:

• Question 12a: Given $A = \{1, 2, 3, 4, 5, 6, 7, 8, 9\}$ and $B = \{2, 3, 5, 7\}$. The common elements are:

  $$A \cap B = \boxed{\{2, 3, 5, 7\}}$$

• Question 12b: Given $P = \{2, 4, 6, 8, 10\}$ and $Q = \{4, 8, 12, 16\}$. The common elements are:

  $$P \cap Q = \boxed{\{4, 8\}}$$

• Question 13a: Given $B = \{\text{letters of the word 'ball'}\}$ and $C = \{\text{letters of the word 'small'}\}$. The common elements are:

  $$B \cap C = \boxed{\{a, l\}}$$

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