Abookstore had 160 copies of magazines. yesterday it sold 3/8 of them. how many copies were sold yesterday?

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?

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.

There are 1872 steps in a building that has 104 floors. each floor has the same number of steps. a second building has the same number of floors but 2 fewer steps between each floor. how many steps are there between each floor of the second building?