solve the following problem: It was 13c yesterday, but the temperature changed by -

Unfortunately, you did not include the specific amount by which the temperature changed. Please provide the missing information so that I can solve the problem correctly.

solve the following problem: It was 13c 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 (-18.6) from the initial temperature (13°C).

Temperature now = Initial 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 solve the problem, I need clarification on what the temperature changed by after 13 degrees Celsius. Could you please provide that information?

To solve the problem, we need to know the change in temperature. The information provided states that the temperature changed by "-" which means we don't have the specific value. To solve it, we need to know the value of the change. Please provide the exact change in temperature, and I will be able to help you solve the problem.