Find the solution of the system of equations. 2x + 4y = -16
–2x+2y = -2
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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?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Find the solution to this system 2,1 1,-2 1,2 -1,2