As shown, suzi starts her hike at an elevation below sea level. when she reaches the end of the hike, she is still below sea level at -127 feet. what was the change in elevation from the beginning of suzi's hike to the end of the hike?

That question can't be answered with the information given in it. 

In order to calculate the answer, we would also need to know
the elevation from which Suzi starts her hike. 

That number is almost certainly in the picture that the words
"As shown" refer to, which you chose not to share.