Which is the following method uses estimation to check 267-154=113?

Write a story that matches with the expression 42x-5 pls hurry

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?

Is this a polynomial function? i need to know asap