Help me with this question please?

20 only answer if 100% sure most high school-aged teens are very active. a. true b. false

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

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36