Final answer:
The altitude, or height above a specific reference point such as sea level or a checkpoint, of the top of the hill is 509 feet.
Step-by-step explanation:
The question is asking for the altitude of the top of the hill, which is defined as the height above a specific reference point, in this case, 'Checkpoint 1'. Therefore, the altitude of the top of the hill is the same as the height above Checkpoint 1. It's important to note, however, that altitude is usually measured from sea level. In this scenario, since the hill rises 509 feet above Checkpoint 1, we can confidently say that the altitude of the top of the hill is 509 feet.
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