Evaluate the following. \[ \begin{array}{r}-9 \times(-3)=\square \\ -21 \div 7=\square\end{array} \]

To evaluate the expressions given: 1. For \(-9 \times (-3)\): - When you multiply two negative numbers, the result is positive. - Therefore, \(-9 \times (-3) = 27\). 2. For \(-21 \div 7\): - When you divide a negative number by a positive number, the result is negative. - So, \(-21 \div 7 = -3\). Putting it all together, we have: \[ \begin{array}{r} -9 \times (-3) = 27 \\ -21 \div 7 = -3 \end{array} \]