Write each biconditional as a conditional and its converse. Then determine whether
the biconditional is true or false. If false, give a counterexample.

2. There is no school if and only if it is Saturday.

3. Two lines intersect if and only if they are not horizontal.

4. |2x| = 4iff x = 2.

5. Use logical equivalence to create a truth table that summarizes the conditional,
converse, and biconditional for statements p and q.

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