In(x)=h in exponential form

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

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

Polygon abcd is a rectangle what is the area