Complete the sentence. this shape has : no right angles, some right angles, no side the same length, all sides the same length ?

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

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.