The parking garage's underground height will be 50 feet.
The height is a vertical distance between two points. It is given in the question that the elevator in the downtown skyscraper goes from the top floor down to the lowest level of the underground parking garage. If the building is 330 feet tall and the elevator descends 380 feet from top to bottom.
The total height of the building above the ground is 330 feet.
The elevator descends 380 feet from top to bottom is 380 feet.
The height of the underground base will be calculated as:-
H = 380 - 330 = 50 feet
Therefore parking garage's underground height will be 50 feet.
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