Final answer:
The difference in elevation between the bottom of the canyon at 87 feet below sea level and the bird's nest at 822 feet above sea level is 909 feet.
Step-by-step explanation:
The student is asking about the difference in elevation a bird experiences when flying from the bottom of a canyon to a nest above sea level. To find this difference, we simply need to subtract the elevation at the bottom of the canyon from the elevation of the nest. The canyon bottom is 87 feet below sea level, which we can represent as -87 feet. The nest is 822 feet above sea level. Calculating the difference gives us:
822 feet (nest) - (-87 feet (canyon)) = 822 feet + 87 feet = 909 feet.
Thus, the difference in elevation the bird experiences is 909 feet.