Each option below lists three expressions. which option lists expressions that are not equivalent? a) 81^3/4 ; 27 ; ^4square root of81^3 b) 8 ; ^4square root of16^3 ; 16^.75 c) (625^.25)^3 ; (625^3)^1/4 ; 125 d) 256 ; 1,296^3/4 ; ^4square root of1,296^3

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?