Is the set of positive irrational numbers closed for the operation of division? If not, give a counter-example.

What is the probability of drawing three queens from a standard deck of cards, given that the first card drawn was a queen? assume that the cards are not replaced.

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

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?