Final answer:
The overall change in temperature from morning to afternoon was a decrease of 3°F, as calculated by subtracting the morning temperature (8°F) from the afternoon temperature (5°F).
Step-by-step explanation:
The question asks about the overall change in temperature when the morning temperature in Chicago was 8°F and it increased to 5°F by the afternoon. To find the overall change, we calculate the difference between the afternoon temperature and the morning temperature. This is done by subtracting the morning temperature from the afternoon temperature: 5°F - 8°F, which equals -3°F. Therefore, the overall change in temperature was a decrease of 3°F.