If x = 2, what is the value of x3 + x - 5?

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

When only separate discreet points are graphed it is called?

What is the rate of change of a line that passes through (2,-5) and (6,-2)?