(x-2y=-5) (2x + 4y =14) what is the value of y

Which best explains why this triangle is or is not a right triangle?

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?

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6