-7 ºF each hour
Explanation:
The problem says that in a total amount of 4 hours the total temperature drop is 28 ºF. We are asked to obtain how many Fahrenheit degrees drop each hour. To obtain the temperature, we just need to divide the total drop temperature by the total amount of time.
The result is 7 ºF. The minus sign is simply written to depict a decrease in temperature.
Step-by-step explanation: