I can recognize proportional relationships using tables and graphs. I can calculate rates and unit rates.
1. Which set of ordered pairs represents a proportional relationship between the x and y values?
A. (0, 0), (1, 2), (2, 4)
B.
(0, 0), (1, 2), (3, 4)
C.
(0, 0), (1, 2), (2, 1)
D. (0, 0), (1, 2), (3,9)

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.

step-by-step explanation:

a and d