2. write a function that models the relationships among x, y, and r. (hint: use the pythagorean theorem.)
then solve the equation for rin terms of x and y.
(3 points: 1 point for the correct pythagorean setup, 1 point for work, 1 point for the solution)

Among the most famous of all meteor showers are the perseids, which occur each year in early august. in some areas the frequency of visible perseids can be as high as 40 per hour. given that such sightings are poisson events, calculate the probability that an observer who has just seen a meteor will have to wait at least five minutes before seeing another.