GEOMETRY! please help :) only if you know

What is the value of x? enter your answer in the box. photo attached.

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 function has the domain x> -11