1. The problem asks for the sign of the expression $$-3.2b \cdot \left(\frac{c}{b} \cdot 0\right)$$. 2. Important rule: Any number multiplied by zero is zero. 3. Inside the parentheses, we have $$\frac{c}{b} \cdot 0 = 0$$ regardless of the values of $$b$$ and $$c$$ (as long as $$b \neq 0$$ to avoid division by zero). 4. Therefore, the entire expression simplifies to $$-3.2b \cdot 0 = 0$$. 5. The sign of zero is neither positive nor negative; it is zero. Final answer: Zero.