What is the value of the angle marked with X?

An architect is designing a water fountain for a park she uses the given function to model the water jet flowing from the fountain nozzles where h(x) gives the height of the water jugs in feet x feet from the starting point h(x)=-1/20x+x+15

Do you mind if you guys me with this question i’m on number 8

If wxyz is a square, which statements must be true? plz < 3