Solve 5x^2=10x + 4 i literally forgot what topic this is!

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

Ill mark the brainliest if you me with the these three questions 7,8,9

How do the definitions, properties, and postulates you've learned about line segments, parallel lines, and angles to define the shapes of polygons