c) If a > b, then when both sides are multiplied by a negative number, the inequality sign reverses.

c) If $a > b$, then when both sides are multiplied by a negative number, the inequality sign reverses.
Therefore, $a \times (-9) < b \times (-9)$.
The symbol in the box is $\boxed{<}$.

3. Give a verbal statement equivalent to each of the following inequalities:

   a) $1 < x \le 10$
   The verbal statement is: "$x$ is greater than 1 and less than or equal to 10."

   b) $x < -3$ or $x > 4$
   The verbal statement is: "$x$ is less than -3 or $x$ is greater than 4."