*The values in the question and the image are different. It is solved below according to the image*
The correct answer is 812 and 2/5 feet.
Convert the mixed fraction into improper fraction.
Distance between the bottom of canyon and sea level = 59 and 9/ 10 feet= 599/10 feet
Distance between the bird's nest and sea level = 752 and 1/2 feet = (752×2 + 1) feet =1505/2 feet
So, the difference between elevation between the bottom of the canyon and the bird's nest = 599/10 + 1505/2 feet
= 59.9 + 752.5 feet = 812.4 feet
= 812 and 4/10 feet
= 812 and 2/5 feet
Hence, the difference between elevation between the bottom of the canyon and the bird's nest is 812 and 2/5 feet .
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