The temperature when Esmt woke up is best represented by a positive or negative number. The temperature at noon can be determined using the expression -5.3 - 12.8, -5.3 + 12.8, 5.3 - 12.8 or 5.3 + 12.8. The temperature at noon was 7.5 or 18.1 degrees below or above zero.

The temperature when Esmt woke up is best represented by a positive number.

The temperature at noon can be determined using the expression -5.3 - 12.8 or -5.3 + 12.8.

Using the expression -5.3 - 12.8, we get -18.1 degrees which means that the temperature at noon was 18.1 degrees below zero.