1) (-11) + 15 = 2) (-14) + (-16) =

3) 5 + (-9) =

4) 21 + 22 =

I dont know if these are supposed to be easy or hard but i dont understand any of this-

1. Remove the parentheses -11-15

2. simplify, -14-16

3.5-9

Step-by-step explanation:

1. 4

2.-30

3.-4

4. 43

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answer

point o.

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.