What do the following changes in the stock prices mean: -$5, $4, and $0

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?

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If f(x) = 3x2 - 2x+4 and g(x) = 5x + 6x - 8, find (f-g)(x).