Final answer:
The difference in elevation between the bottom of the canyon and the bird's nest is 815.7 feet.
Step-by-step explanation:
To find the difference in elevation between the bottom of the canyon and the bird's nest, we need to subtract the elevation of the canyon from the elevation of the nest. First, let's convert the elevations to decimal form. The canyon is 77.1 feet below sea level, so the elevation is -77.1 feet. The nest is 738.6 feet above sea level. Now, we subtract the elevation of the canyon from the elevation of the nest: 738.6 - (-77.1) = 815.7 feet. Therefore, the difference in elevation between the bottom of the canyon and the bird's nest is 815.7 feet.