If you know any please answer! I would really appreciate it!

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

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)