write the descriptions from fastest unit rate to slowest unit rate 1/2 mile in 1/3 hour 4/5 mile in 1/4 hour 7/4 mile in 2/5 hour 1/4 mile in 1/10 hour

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.

ab will be equal to

step-by-step explanation:

is their an equation anywhere i can take a   look at it and see if i am right.