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1) X= 9 because you add the three sides then subtract 60 by that number

2)X=15 solve this the same way as number 1

3)X= 44 same as question 1 and 2

4) Add up the numbers 39 +72+89 then subtract 251 by the number you get when adding the three numbers

5) when you add the three side lengths 90ft, 110ft, and 100ft you will get 300ft done so if her friend added 80 to the fourth and final side she would have more than a total of 360ft. so Heather is incorrect.

6) you add the three measures 227, 381,and 294 then subtract 1221 by the sum of the three measures added together which should get you 319 for the other side length.

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.

3 qrs + 3/2 xy hope this : /

step-by-step explanation: