I need to know what x is for this equation

All per-unit concepts rely on ratios,meaning,to provide a type of measurement

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?

Nikolas calculated the volume of the prism. his work is shown below.