Using proportions, it is found that the temperature after 4 hours was of 0º.
What is a proportion?
A proportion is a fraction of a total amount, and the measures are related using a rule of three.
The temperature rose 3º every hour, for 4 hours, hence the total rise was of:
R = 3º x 4 = 12º.
Considering the initial temperature, the the temperature after 4 hours was of:
T = -12º + 12º = 0º.
More can be learned about proportions at https://brainly.com/question/24372153
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