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What values of data might affect the statistical measures of spread and center

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

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1