Final answer:
The difference in temperature from when Luke woke up to when he went to bed was 3°F higher at night. He woke up to 79°F, it rose to 94°F by noon, and then dropped to 82°F by bedtime.
Step-by-step explanation:
The student has asked about a change in temperature recorded during a day. When Luke woke up, the temperature was at 79°F. By noon, the temperature had increased by 15°F, making it 79°F + 15°F = 94°F. When Luke went to bed, the temperature had dropped 12°F from the noon reading, so it was 94°F - 12°F = 82°F.
To find the difference in temperature between when Luke woke up and went to bed, we subtract the morning temperature from the nighttime temperature: 82°F - 79°F = 3°F. So, the temperature when Luke went to bed was 3°F higher than when he woke up.