(3 + 2) ? = 5 x 8

Can some one help me

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

Answer for 10 points show work you guys in advanced < 3

Need plz been trying to do it for a long time and still haven’t succeeded