Which equation must be true for m(x) and n(x) to be inverse?

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

What value of x is in the solution set of 4x - 12 s 16 + 8x? -10 -9 -8 -7

A+b= 17, ab=70, find the value of |a-b|