Which of the following is the estimated sum of 87 and 110 using compatible numbers?
A.) 100
B.) 160
C.) 200
D.) 260

200

Step-by-step explanation:

Make the numbers compatible:

87 can be rounded to 90, and 110 can remain the same because it is already compatible.

Add:

90 + 110 = 200

Hope this helps :)

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.