The problem is in the pic pls help I've been working on it for hours

Answer:
first part is
snow crest - x = 11180.21 or 28768.31 - x = 11180.21
the elevation of Mt Wilson is 17 588.1
Step-by-step explanation:
so it is
snow crest - x = 11180.21
so the elevation of Mt Wilson is
snow crest - 11 180.21 = 17 588.1