Solve the following problem:

It was 13°C yesterday, but the temperature changed by −18.6° overnight. What is the temperature now?

To find the temperature now, we need to subtract the change in temperature from yesterday's temperature:

Temperature now = Yesterday's temperature - Change in temperature

Temperature now = 13°C - (-18.6°C)

Temperature now = 13°C + 18.6°C

Temperature now = 31.6°C

Therefore, the temperature now is 31.6°C.

To find the temperature now, we need to subtract the change in temperature from the initial temperature.

Step 1: Start with the initial temperature of 13°C.
Initial temperature: 13°C

Step 2: Subtract the change in temperature of -18.6°C.
Temperature after change: 13°C - (-18.6°C)
Temperature after change: 13°C + 18.6°C

Step 3: Adding the numbers:
Temperature after change: 31.6°C

Therefore, the current temperature is 31.6°C.