Hi, can you please help me?
solve for EF

see below

Step-by-step explanation:

ED = 2 units

DF = 7 units

EF^2 = 2^2 + 7^2

EF^2 = 4 + 49

EF^2 = 53

EF = 7.28

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.

answer: i don't understand. what are the options

step-by-step explanation: