It was 13 degrees Celsius yesterday, but the temperature changed by —18.6 degrees overnight. What is the temperature now?

To determine the current temperature, we need to subtract 18.6 degrees Celsius from yesterday's temperature of 13 degrees Celsius:

13 degrees Celsius - 18.6 degrees Celsius = -5.6 degrees Celsius

Therefore, the current temperature is -5.6 degrees Celsius.

To find the current temperature, we need to subtract the change in temperature from yesterday's temperature.

Yesterday's temperature: 13 degrees Celsius
Change in temperature: -18.6 degrees Celsius

To find the current temperature, we subtract the change from yesterday's temperature:

Current temperature = Yesterday's temperature - Change in temperature
Current temperature = 13 degrees Celsius - (-18.6 degrees Celsius)
Current temperature = 13 degrees Celsius + 18.6 degrees Celsius
Current temperature = 31.6 degrees Celsius

Therefore, the current temperature is 31.6 degrees Celsius.