Respuesta :

Solution:

  • => When Emily woke up, temperature: 8° F
  • => By 12:00 PM, temperature: 8 + 3° F = 11° F
  • => In the afternoon, temperature: 11 + 6° F = 17° F
  • => By Bedtime, temperature: 17 - 21° F = -4° F

The temperature when Emily went to bed was -4° F.