I would help but I’m not sure how, please do not press that link or else it will track your address! <33
The answers you could use are both the second and the forth. But mostly the fourth.
Desmonds height let’s say x = y + 3
51 ft is the answer
Explanation
The hight of the man divided by the hight of school ( which is unknown )
Equal
The length of the shadow of the man divided by the shadow of the school
Cross multiplication and find the value of unknown x which is 51... and ya