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What is the missing constant term in the perfect square that starts with x^2 -20x

The volume of a cube is 8 in to the 3rd power. how long is each side?

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?