The temperature at 4:00 p.m. was -4°
Step-by-step explanation
The temperature at 2:00 a.m. was −12° and at noon, the temperature had risen 16°.
So, the temperature at noon was = (-12° + 16°) = 4°
Now at 4:00 p.m., the temperature had dropped 8°
So, the temperature at 4:00 p.m. was = (4° - 8°) = -4°