Question

When you woke up on Monday, the temperature is -8 °C. During the day, the temperature rises 3 °C. By the time you wake up on Tuesday, it has dropped 9 °C. What is the temperature when you wake up on Tuesday?

Answer 1

By convention, a temperature rise is additive and a temperature drop is subtractive.

The initial temperature on Monday was -8 °C.

It rises 3 °C, thus the new temperature was -8 °C + 3 °C = -5 °C.

Finally, the temperature drops by 9 °C, thus the final temperature was

-5 °C - 9 °C = -14 °C.

Answer:

The temperature was -14 °C when you woke up on Tuesday