find the value of each variable. Write your answer as an integer or in simplest radical form. Help!!!

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?

Ten times the square of a non-zero number is eqaul to ninety times the number

Acircle has a circumference of 28.36 units what is the diameter of the circle