How do you solve 2 - 1/4

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?

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

Simplify the following expression 48^1/2