Zachary found a string of pearls that was 4 3/4 pounds. He found
another that was 3 1/2 pounds. How
many pounds of pearls did
Zachary find?

He has 8 1/4 or 8.25 pounds of pearls

Step-by-step explanation:

4 3/4 + 3 1/2

You change 3 1/2 to 3 2/4 and then add them normal and change the improper fraction to a mixed number.

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.