Is ((-7,5),(-5,5),(2, -2),(3,5)) a function?

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Which expression is rational? 6. , square root two, square root 14, square root 49

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie