Please help! I will mark you as brainliest!

First flip

We know the probability of head is 2/7

Since only 2 things can happen, and both cannot happen at once (mutually exclusive), we write

P(tail) = 1 - P(head) = 1 - 2/7 = 5/7

The probability of tail is 1 minus probability of head.

Second flip

You're still using the sam coin, and whatever you got on the first flip doesn't affect your chances of getting head... on the second flip, I mean. So,

2/7; 5/7; 2/7; 5/7

from top to bottom

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.