Simplify
( 5w + 13 ) + ( 2w + 1)

2-digit numbers less than 91 which are 1 less than a multiple of 10

Answer these questions showing your work plz

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?