Final answer:
After the sequence of temperature changes, the temperature would be -45°F following the 70°F decrease due to the arctic wind.
Step-by-step explanation:
The temperature was −5°F when Sam went to school on Monday. To find out the temperature after the various changes, we'll perform a series of additions and subtractions. First, the temperature rose 25°F during the day, then fell by 35°F during the night. A heat wave then increased the temperature by 40°F, followed by a decrease due to an arctic wind overnight, dropping the temperature by 70°F.
- Initial temperature: -5°F
- Rise by 25°F: -5°F + 25°F = 20°F
- Drop by 35°F: 20°F - 35°F = -15°F
- Increase by 40°F heat wave: -15°F + 40°F = 25°F
- Decrease by 70°F arctic wind: 25°F - 70°F = -45°F
Thus, after the 70° decrease, the temperature would be -45°F.