Answer: 600 feet.
Explanation:
To find change in hiker's elevation we will subtract hiker's initial elevation from hiker's elevation at the end of trail:
Change in elevation=532-(-68),
we are subtracting negative 68 because at the beginning of trail hiker was 68 feet below sea level.
Change in elevation=532+68;
Change in elevation=600.
Therefore, the change in hiker's elevation is 600 feet.