Plz help due tomorrow

2nd one and 4th one

Step-by-step explanation:

Number 2 is just putting the expression in a different order, but it is still equivalent.

Number 4 just added an extra plus sign which doesn't cause anything for the expression, it's really just a filler.

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: haha (: i’ll go see what it is

step-by-step explanation: