Select the correct answer. Which relation is 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?

9/10 divide by -3/15 as a mixed number

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?