On a given morning the temperature was 71°f. the temperature dropped 5°f and then rose 8°f. how much does the temperature need to rise or fall to return to the initial temperature of 71°f?

a) fall 8°f
b) fall 3°f
c) rise 8°f
d) rise 5°f

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.