Final answer:
The evening temperature at 7:00 pm is calculated by adding the midday increase and subtracting the evening decrease from the early morning temperature. Starting from -8°F at 5:00 am and after the subsequent changes, the resulting evening temperature is 2°F.
Step-by-step explanation:
The student is asking how to calculate the evening temperature after a sequence of changes throughout the day. Initially at 5:00 am, the temperature is 8°F below zero. By noon, the temperature increases by 15°F, and at 7:00 pm, it decreases by 5°F. We can calculate the evening temperature by starting with -8°F (the 5:00 am temperature), adding 15°F (the rise by noon), and then subtracting 5°F (the drop by 7:00 pm).
Here is the calculation:
5:00 am – (-8°F)
Noon – (-8°F + 15°F = 7°F)
7:00 pm – (7°F - 5°F = 2°F)
Therefore, the evening temperature at 7:00 pm is 2°F.