Evaluate the following. Click on "Not a real number" if applicable. \( -\sqrt{144}=\square \)

The expression \( -\sqrt{144} \) evaluates to \( -12 \) because the square root of 144 is 12, and the negative sign in front indicates the opposite value. Therefore, the answer is \( -12 \). If you click on "Not a real number," you should not. The result is indeed a real number!