Final answer:
After recording an initial temperature of 62°F, the temperature went up by 6.5°F and then down by 8.7°F, resulting in a final temperature of 59.8°F.
Step-by-step explanation:
Joaquin initially recorded a temperature of 62°F for his science class. The temperature then increased by 6.5°F in the afternoon, which would make the new temperature 62°F + 6.5°F = 68.5°F. However, in the evening the temperature decreased by 8.7°F, so we would then subtract 8.7°F from 68.5°F to find the evening temperature, resulting in 68.5°F - 8.7°F = 59.8°F.