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Find the solutions for a triangle with a =16, c =12, and b = 63º

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?

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14