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Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

Which value of c would make he following expression completely factored? 8x+cy

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?