Subtract the polynomial

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?

Combine like terms to make a simpler expression 3z+z

1: 4 if the wew 35 surfboards at the beach how many were short boards?