I need help please Will mark the Brainliest

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

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Need showing work for this problem 56.25 ×25.80