Where do all the points on a plane on a plane equidistant from the endpoints of ab overbarthe endpoints of ab lie?

Which expression is equivalent to? assume x > 0 and y > 0.

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?

The focus of parabola is (-4, -5), and its directrix is y= -1. fill in the missing terms and signs in parabolas equation in standard form