The student is -3.75 ft below sea level, and the absolute value is 3.75 ft.
The vertical number line starts at negative 5.5 and the tick marks are every one half unit up to positive 1.5. The value negative 3.75 is labeled. Therefore, the student is -3.75 ft below sea level.
The absolute value represents the distance between the plotted value and zero (sea level) without considering the direction (above or below). In this case, the absolute value is 3.75 ft.