Final answer:
A climber on the summit of Mt. Everest is 65,229 feet above the bottom of the Marianas Trench, making the correct answer option (a) 65,229 feet.
Step-by-step explanation:
To calculate how many feet above the bottom of the Marianas Trench a climber who has reached the top of Mt. Everest is, we need to consider the altitude of Mt. Everest and the depth of the Marianas Trench. The altitude of Mt. Everest is 29,028 feet, and the depth of the Marianas Trench is -36,201 feet. To find the difference in elevation between the two, we add the absolute values of both elevations:
29,028 feet (Mt. Everest's altitude) + 36,201 feet (Marianas Trench's depth) = 65,229 feet.
Therefore, a climber on the summit of Mt. Everest is 65,229 feet above the bottom of the Marianas Trench. The correct answer to the question is option (a) 65,229 feet.