Given value.
21. Target value: 43
2.5 + 5 X 6-2

answer: 180

step-by-step explanation:

12-2=10

20-2=18

18x10=180

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.

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

-2

7 - 9 = -2

reversed:

-2 + 9 = 7