Nadia is mountain climbing. She started at an altitude of 19.26 feet below sea level and then changed her altitude by climbing a total of 5,437.8 feet up from her initial position. What was Nadia’s altitude at the end of her climb?

Nadia began 19.26 feet below sea level, so her starting altitude was −19.26 feet. After climbing 5,437.8 feet, her altitude was −19.26 + 5,437.8 = 5,418.54 feet. Therefore, she ended 5,418.54 feet above sea level.

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