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6.4

Step-by-step explanation:

Area = (Base * Height)/2

Height = 5.4

Base = Area/Height = 2*(17.28/5.4) = 6.4

6.4

Extra:

Hypotenuse = sqrt(Base^2 + Height^2) = sqrt(6.4^2 + 5.4^2) = sqrt(40.96 + 29.16) = sqrt(72.12) = 8.49234949822...

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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.