A booster club sells T-shirts, sweatshirts, and hats. The total cost for
2
T-shirts,
3
sweatshirts, and
1
hat is
$
140.
The total cost for
3
T-shirts,
1
sweatshirt, and
2
hats is
$
110.

The total cost for
1
T-shirt,
2
sweatshirts, and
2
hats is
$
100.
Which statement is true?

a

step-by-step explanation:

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.

what is the answer?