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What is the slope of a line that is perpendicular to y = 3x + 1

Measures of the angle of r, 31 s (x+4) t (3x+9)

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?