Explain why a commercial that says "80% of dentist use this toothpaste" might be misleading

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

Which expression is not a polynomial?

Secant be and cf intersect at point d inside a what is the measure of cde